sentences:  Little Sark is roughly triangular in shape, some two-thirds of a mile/one kilometre in width in the south and a mile/one and a half kilometres in length from north to south.It is joined to the larger part of the island, Great Sark by a narrow isthmus known as La Coupée, a high ridge above the sea which is only some ten feet/three metres in width.This is gradually being eroded and Little Sark will eventually become an island (a similar process is likely to have occurred with Brecqhou close to Sark's west coast).