Original sentence: East Falkland () the largest of the Falkland Islands in the South Atlantic, has an area of  6,605 square kilometres (2,550 sq mi).The highest point, and the highest point in the whole island group, is Mount Usborne, , in the Wickham Heights.The island is almost bisected by two deep fjords, Choiseul Sound and Brenton Loch-Grantham Sound which leaves the northern portion and Lafonia in the south, connected only by an isthmus just under 2.5 km (1.5 mi )wide
Edited sentence: East Falkland () the largest of the Falkland Islands in the South Atlantic, has an area of 2,550 sq mi (6,605 square kilometres).The highest point, and the highest point in the whole island group, is Mount Usborne, 2,313 ft (705 m), in the Wickham Heights.The island is almost bisected by two deep fjords, Choiseul Sound and Brenton Loch-Grantham Sound which leaves the northern portion and Lafonia in the south, connected only by an isthmus just under 1.5 mi  (2.5 km) wide