Bac an Eich is a Corbett of 849 m in Highland. It stands 184.7 m above its nearest neighbour, Beinn Mheadhoin (Highland, NH258477), 3.8 km to the east.
On the Corbetts height ladder it sits between Sgurr Ghiubhsachain (849.2 m) and Beinn nan Imirean (848.3 m). Its nearest higher summit, Sgurr na Fearstaig (1,014.8 m, 5.2 km south), is a listed top not profiled here. The highest point is recorded as embedded rock, not a cairn.