Sgùrr Thuilm is a steep sided, craggy mountain positioned at the eastern end of a winding ridge which also contains the Munro Sgùrr nan Coireachan and several other less prominent peaks.
Sgùrr Thuilm has three distinct ridges: the curved western ridge connects it to Sgùrr nan Coireachan; the northeastern ridge runs into Glen Peann via a subsidiary top Meall an Fhir-eoin; and the southwestern ridge, named Druim Coire a' Bheithe, drops to Glenfinnan Lodge.