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Hiking trails & Routes

Cefn Onn Quarry – Coed Tranch-yr-Hebog Quarry loop from Thornhill

Hiking trails & Routes

Cefn Onn Quarry – Coed Tranch-yr-Hebog Quarry loop from Thornhill

Moderate

4

hikers

Cefn Onn Quarry – Coed Tranch-yr-Hebog Quarry loop from Thornhill

02:27

8.66km

190m

Hiking

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: April 29, 2026

Waypoints

A

Start point

Bus stop

Get Directions

1

4.18 km

View of Bristol from Purdown Quarry

Highlight (Segment) • Viewpoint

2

4.36 km

Cefn Onn Quarry

Highlight • Structure

Cefn Onn Quarry is a former slate quarry in Cardiff. It is situated next to Coed Tranch-yr-Hebog and Wern Ddu forests. Enjoy some lovely views from here over the surrounding Vale of Glamorgan and nearby towns.

Tip by

3

4.50 km

Coed Tranch-yr-Hebog Quarry

Highlight (Segment) • Structure

Not too difficult - just be careful as you are close to the quarry edge.

Tip by

4

4.78 km

Forest Trail

Highlight • Trail

Good terrain, easy to ride and flowing.

Tip by

5

5.17 km

Technical Forest Trail

Highlight (Segment) • Forest

Technical (but fun) trail. Rocky, rooty, and sometimes muddy following rain. Keep alert for your line choice.

Tip by

6

6.65 km

Morgraig Castle

Highlight • Castle

B

8.66 km

End point

Bus stop

Way Types & Surfaces

Way Types

3.69 km

2.00 km

1.71 km

930 m

311 m

Surfaces

2.76 km

2.19 km

1.42 km

1.16 km

1.03 km

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (260 m)

Lowest point (80 m)

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Weather

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Today

Monday 25 May

32°C

17°C

0 %

Additional weather tips

Max wind speed: 8.0 km/h

to get more detailed weather forecasts along your route

Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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