Marilyn · islands
Griomabhal [Griomaval]
A 497m hill on the Isle of Lewis in the Outer Hebrides with at least 150m of prominence — enough to feel like a real summit rather than a shoulder. The modest height belies the quality of the walking.
Quick facts
- Height
- 497m/ 1630ft
- Difficulty
- 1 / 5Easy
- Grid ref
- NB 01201 22004
Download GPX route file
Standard route
Standard route
A steady ascent on island paths with sea views in multiple directions to the 497m summit. The walking is straightforward with clear views opening up as you gain height. Allow 2-4 hours.
Terrain
Mixed island landscape with coastal rock, peat and grass. The sea is visible from most points on the walk.
In winter
Island winters are mild but stormy. Snow is rare at low levels. The main winter challenge is short daylight and frequent gales.
Best time of year
Getting there
- Glasgow9h 18m
- Edinburgh11h 28m
OS maps: OS Landranger 13, OS Explorer 458
Current conditions
Daylight Today
17h 21mwalking daylight
- Sunrise
- 05:34
- Sunset
- 21:17
- Civil dawn
- 04:45
- Civil dusk
- 22:06
NOAA Solar Calculator · 2 May 2026