The boundary between Lewis and Harris is where the island narrows between Loch Resort (Reasort, opposite Scarp) on the west and Loch Seaforth (Shìophoirt) on the east (north of the more obvious isthmus at Tarbert).
A fronteira entre Lewis e Harris é onde a illa estréitase entre Loch Resort (Reasort, fronte a Scarp) no oeste e Loch Seaforth (Shìophoirt) no leste (ao norte do istmo máis obvio en Tarbert).