It stands at the head of Glen Finnan approximately 7 kilometres (4 mi) north of Loch Shiel.

It is positioned at the head of Glen Finnan and is invariably climbed along with the neighbouring Munro of Sgùrr nan Coireachan to which it is joined by a rocky ridge.

To the south and east is the narrow Gleann Cuirnean which divides Sgùrr Thuilm from Streap, a neighbouring Corbett.

Sgùrr Thuilm can be climbed from both Glen Finnan to the south, or from the northeast by way of the public road at the west end of Loch Arkaig.

The return to Glen Finnan can be achieved by descending south and then southwest down the Druim Coire a' Bheithe.