 The northern part of the island is called Lewis, the southern is Harris and both are frequently referred to as if they were separate islands.The boundary between Lewis and Harris is where the island narrows between Loch Resort (', opposite Scarp) on the west and Loch Seaforth (') on the east (north of the more obvious isthmus at Tarbert).The island does not have a one-word name in either English or Scottish Gaelic, and is referred to as 'Lewis and Harris', 'Lewis with Harris', 'Harris with Lewis' etc.