Thomas’s Mountain stands west of Millstone Mountain and northeast of Slieve Donard. Thomas and Millstone were part of the Mourne land acquired by the National Trust from the Annesley Estate in 1991.
- Summit height
- Height not listed
Planning a walk
Choose a route that suits your group and check access before setting out. Take a current map and know how to use it. Even the lower hills can have rough, steep or exposed ground.
Sources & height notes
Height unavailable: the checked map peak has no elevation tag. No estimate or neighbouring height is substituted.
Locations are based on mapped summit points. For walking directions, use a current map and your chosen route.
Data licence: ODbL 1.0. Source credits.
OpenStreetMap contributors — Geofabrik snapshot 6 October 2026
Checked 2026-10-08: OpenStreetMap contributors — Geofabrik snapshot 6 October 2026 · Geofabrik regional OSM extract · OpenStreetMap attribution and ODbL licence · National Trust — estate acquisition.