Running through the Tierra del Fuego archipelago, the Beagle Channel is a scenic and wonderfully calm strait that has become a hugely popular cruise destination. Named in 1830 after a charting voyage by the HMS Beagle—the ship that later became famous for carrying English evolutionalry biologist Charles Darwin on his five-year journey of discovery—the channel is one of a trio of navigable passages around the tip of South America. Some 240 kilometers long (almost 150 miles), the channel extends from Nueva Island in the east to Darwin Sound and Cook Bay in the west. Its western end lies within Chile, and its eastern end forms a segment of the border between Chile and Argentina. By far the largest sight along the channel is the town of Ushuaia in Argentina, which has much to offer the day-tripper or overnight visitor. Other highlights of a cruise include a slew of natural sights, from views of snow-covered glaciers to wildlife spotting at Isla de los Lobos (also called Sea Lion Island) and Isla de los Pájaros (Bird Island).