Beinn Tharsuinn is a Graham of 692 m in Highland. Its closest neighbour in this register, Meall Mor (Highland, NH515745), is 10.2 km away.
All four of its nearest neighbours lie to the west, so it stands at the eastern edge of its group. It shares its height of 692 m with Benbreen. On the Grahams height ladder it sits between Mullwharchar (692.9 m) and Ettrick Pen (691.8 m). The summit is marked by a trig point.