The Easains stand in splendid isolation, hemmed in by valleys on three sides, giving Stob Coire Easain a substantial topographic prominence of 611 metres. The mountain is the highest point on a nine kilometre long ridge which runs the entire length of the western side of Loch Treig; the eastern side of this ridge drops very steeply to the waters of the loch. To the west of the mountain is the valley of the Allt na Lairig. A subsidiary ridge going north from the summit is initially steep and craggy as it descends to the head of Coire Laire. To the south of the summit the main ridge descends gently over Irlick Chaoile to the lonely country at the head of Loch Treig. All drainage from the mountain goes into the River Spean to find its way to the west coast of Scotland via Loch Linnhe.