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Hiking trails & Routes

Harperrig Reservoir – Cairns Castle Ruins loop from Cairns Castle

Hiking trails & Routes

Harperrig Reservoir – Cairns Castle Ruins loop from Cairns Castle

Moderate

5.0

(1)

8

hikers

Harperrig Reservoir – Cairns Castle Ruins loop from Cairns Castle

02:52

10.4km

170m

Hiking

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: August 23, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Pentland Hills Regional Park

Waypoints

A

Start point

Parking

1

5.18 km

Cauldstane Slap

Highlight • Mountain Pass

2

8.71 km

Harperrig Reservoir

Highlight • Natural

Harperrig Reservoir was created in 1860 as part of a scheme to create a safe and reliable supply of drinking water for Edinburgh. The dam was raised in 1890 to …

Tip by

3

10.0 km

Cairns Castle Ruins

Highlight • Historical Site

Cool castle, track around south side of reservoir is rough but doable with some questing!

Tip by

B

10.4 km

End point

Parking

Way Types & Surfaces

Way Types

8.19 km

2.02 km

213 m

Surfaces

7.99 km

1.00 km

595 m

559 m

276 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 (430 m)

Lowest point (270 m)

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Weather

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Monday 19 October

12°C

8°C

-- %

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