Tholt-y-Will Glen
A steep glen on the flank of Snaefell above the Sulby valley, with a waterfall and forest walks.
Updated 16 October 2026
Tholt-y-Will runs down the western flank of Snaefell into the Sulby valley, a steep glen with a waterfall on the stream and paths climbing through conifer plantation and older broadleaf above the road. The Sulby reservoir, the largest on the island, lies below it, and the road continues up past the glen to the Bungalow on the mountain course. It is one of the higher and wilder of the national glens with open moorland above.
Background
Tholt-y-Will Glen fills a small side valley that branches off Sulby Glen close to Sulby Reservoir. It holds official status among the Manx National Glens and is the only one in the island's mountainous centre, kept in a semi-natural state by the Forestry Amenity and Lands Directorate. A small car park and picnic area sit at its entrance. The main glen below runs north to south for about 5 km, its floor narrowing in places to only 50 metres between steep sides, with the Sulby River and the A14 road along it. Sulby Reservoir, at the head of the glen, was created in 1982.
Source: Wikipedia, "Sulby Glen"
Highlights
- The waterfall - the drop on the stream partway up the glen.
- The forest paths - routes climbing through plantation and older woodland.
- The Sulby reservoir - the island's largest, in the valley below.
- The moorland above - the open ground running up towards Snaefell.
When to go
April to October gives the best footing and the fullest colour. Winter can leave the upper paths waterlogged. Autumn is the best month for the woods.
Good to know
The paths are steep and rough with limited waymarking. Forestry work closes sections without much notice. There are no facilities at the glen.
Nearby
Snaefell is above, and Ramsey is northeast.
What to pack for Tholt-y-Will Glen
Chosen from what this place is for. Tap a kit for the full checklist.
- Broken-in walking shoes or boots - Grip and ankle support matter more than looks; never hike in brand-new boots. Find on Amazon
- Layers + a waterproof shell - Mountain weather turns fast; a packable rain jacket saves the day. Find on Amazon
- Daypack with rain cover - 20-30 litres holds water, snacks, layers and a first-aid kit. Find on Amazon
- Offline maps + a power bank - Download the trail before you lose signal; carry backup charge. Find on Amazon
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