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Hiking trails & Routes

Vale of Glamorgan

Porthkerry Viaduct – The Knap loop from Cardiff Airport

Hiking trails & Routes

Vale of Glamorgan

Porthkerry Viaduct – The Knap loop from Cardiff Airport

Moderate

17

hikers

Porthkerry Viaduct – The Knap loop from Cardiff Airport

02:18

8.36km

140m

Hiking

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

Last updated: August 22, 2026

Waypoints

A

Start point

Camper Parking

Get Directions

1

1.26 km

Porthkerry Viaduct

Highlight • Historical Site

The marvellous 16-arch Porthkerrry Viaduct stands at a whopping 110 feet (33m) high. It was designed and engineered by James and William Szlumper and was originally built to carry coal …

Tip by

2

2.69 km

Cold Knap Roman Site

Highlight • Historical Site

The monument consists of the remains of a Roman rectangular courtyard building dating to the 2nd or 3rd centuries AD.

It is located close to the beach at Cold Knap …

Tip by

3

2.76 km

The Coffi Box

Highlight • Cafe

4

2.82 km

Knapp

Highlight • Settlement

5

3.10 km

View of Knap Gardens Marine Lake

Highlight • Lake

6

3.24 km

The Knap

Highlight • Settlement

I love a duck so stood tall. Lovely area

Tip by

7

5.05 km

Barry Castle

Highlight • Castle

8

7.06 km

Porthkerry Pebble Beach

Highlight • Beach

B

8.36 km

End point

Camper Parking

Way Types & Surfaces

Way Types

3.38 km

1.85 km

1.41 km

886 m

797 m

Surfaces

5.11 km

1.41 km

1.01 km

570 m

206 m

< 100 m

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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 (60 m)

Lowest point (0 m)

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Weather

Powered by Foreca

Tuesday 25 August

25°C

17°C

11 %

Additional weather tips

Max wind speed: 17.0 km/h

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