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. This ridge encloses Coire Thollaidh, in which the River Finnan has its source. The north side of the mountain is craggy with several coires dropping towards Glen Pean. To the south and east is the narrow Gleann Cuirnean which divides Sgùrr Thuilm from Streap, a neighbouring Corbett.