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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 walkable paths.

Last updated: August 22, 2026

Waypoints

A

Start point

Camper Parking

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 to Barry Docks.

It's located in Porthkerry Park, where there's also a wonderful little café serving delicious food and drinks, Mrs Marcos.

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 with expansive views over the Bristol Channel.

Stone footings survive on the northern part of the site up to four courses high. Located in the south-east corner is a cellared room.

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

5.04 km

Barry Castle

Highlight • Castle

8

7.05 km

Porthkerry Pebble Beach

Highlight • Beach

B

8.36 km

End point

Camper Parking

Way Types & Surfaces

Way Types

3.49 km

1.79 km

1.40 km

940 m

736 m

Surfaces

5.13 km

1.42 km

1.08 km

607 m

111 m

< 100 m

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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

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Today

Wednesday 4 November

12°C

8°C

27 %

Additional weather tips

Be ready for wind and tricky conditions.

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