Routes

Planner

Features

Updates

App

Get the komoot app

Join 45 million outdoor enthusiasts: navigate, discover, adventure.

4.8/5

Based on more than 300k user ratings

Download komoot now

Visit the App Store, Google Play or scan the QR code with your phone to download instantly.

Get the App

Get the komoot app

Join 45 million outdoor enthusiasts: navigate, discover, adventure.

4.8/5

Based on more than 300k user ratings

Download komoot now

Visit the App Store, Google Play or scan the QR code with your phone to download instantly.

Ascent to Lac de Castérau

Ascent to Lac de Castérau

Add your photos to this highlight

Drag a photo here or browse to upload.

Ascent to Lac de Castérau

People Who've Recommended This Place

genife68

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Christian

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Ptiju

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Elie

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Lataste Jacques

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Jérôme

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Joel 🤖

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

andreas.sarasa

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Julia

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Diana

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Achim Zumpfe

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Request to follow

KRIKROU

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Touren R

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Sergio Garcia

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Michel

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Rosec

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

IlianGZ🐃

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Ness B.

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

CHEVALOBRE

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Berni

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Mulvig

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Nicolas Saillour

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Sabine29

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Marie

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Done

Recommended by 25 hikers out of 26

This Highlight is in a protected area

Please check local regulations for: Parc national des Pyrénées (cœur)

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Save

Location: Laruns, Oloron-Sainte-Marie, New Aquitaine, France

Everything You Need To Get Outside

Ready-Made Inspiration

Browse personalized adventures tailored to your favorite sport

A Better Planning Tool

Build your perfect outdoor experience using the world’s best outdoor tech

More Intuitive Navigation

Turn-by-turn navigation and offline maps keep your adventure on track

A Log of Every Adventure

Save every adventure and share your experiences with your friends

Save

See hikes here

Take Me There

Routes here

Best Hikes to Ascent to Lac de Castérau

4.9

(20)

329

hikers

1. Ossau Valley – Lac Roumassot loop from Urdos

22.6km

09:37

1,420m

Expert hike. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.

Navigate

Send to Phone

Save

How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy

Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.

Intermediate

Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.

Expert

More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.

Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.

Expert

4.8

(5)

163

hikers

2. Lac de Bious-Artigues – Ossau Valley loop from Urdos

14.2km

05:03

620m

Expert hike. Very good fitness required. Mostly accessible paths. Sure-footedness required.

Navigate

Send to Phone

Save

How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy

Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.

Intermediate

Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.

Expert

More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.

Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.

Expert

hikers

3. Refuge d'Ayous – Ossau Valley loop from Urdos

17.2km

06:30

1,020m

Expert hike. Very good fitness required. Mostly accessible paths. Sure-footedness required.

Navigate

Send to Phone

Save

How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy

Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.

Intermediate

Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.

Expert

More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.

Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.

Expert

Tips

genife68

April 11, 2021

Steep ascent from Cabane de la Hosse to the Grad to Lac de Castérau

Translated by Google •

In the know? Log-in to add a tip for other adventurers!

Details

Informations

Elevation 1,730 m

Weather

Today

Thursday 9 October

12°C

5°C

0 %

If you start your activity now...

Max wind speed: 2.0 km/h

Change Starting Time

When do you want to start?

To ensure you can rely on your forecast, only the weather data for the next 46 hours is available.

Today

Save

Cancel

Most visited during

January

February

March

April

May

June

July

August

September

October

November

December

See hikes here

Take Me There

Location: Laruns, Oloron-Sainte-Marie, New Aquitaine, France

Other Popular Places to Check Out

Lac Roumassot

Refuge d'Ayous

Lac Bersau

Lac de Peyreget

Parking Bious-Oumettes

Vues depuis le barrage

Pont sur le gave de Bious

View of Pic du Midi d'Ossau from Lac Gentau

Vue sur la Montagne de Bious

Pic du Midi d'Ossau Circuit

View of Pic du Midi d'Ossau from Ibón de Escalar

Pic d'Ayous

Download the app

Follow Us on Socials

Community guidelines

Vulnerability disclosure program

Imprint

Information for law enforcement

We value your privacy ⛰️

We use cookies that are essential for the app and website to function correctly or are used to produce aggregated statistics. With your consent, we and our third-party partners will also use tracking technologies to improve the in-app and navigation experience, and to provide you with personalized services and content. To give your consent, tap Accept all cookies. Alternatively, you can customize your privacy settings by tapping Customize Preferences, or by going to Cookie Preferences at any time. If you don’t want us to use non-technical tracking technologies, tap Refuse. For more information about how we process your personal data through cookies, take a look at our Privacy Policy.