Magdalena Channel and Agostini Sound in Tierra del Fuego, Chilean Patagonia.

Agostini Sound is a fjord in Tierra del Fuego that separates two branches of the Darwin Cordillera, part of the longest range found in the Andes. It was named after Alberto María de Agostin (1883–1960), who was an Italian missionary in Tierra del Fuego and a passionate mountaineer, explorer, geographer, ethnographer, photographer, and cinematographer. He was the first person to reach several of the peaks in the region, as well as numerous glaciers and fjords. The Cordillera contains some of the most rugged peaks in southern Chile, many covered in ice. The fjord was carved by the Aquila Glacier during the last Ice Age and is part of the Magdalena Channel, which serves as a major navigation route that connects the Strait of Magellan with the Cockburn Channel. Local wildlife includes condors, dolphins, sea lions, and penguins. (Photograph taken 30 January 2015 by Deepika Shrestha Ross and caption by Gary Griggs, University of California, Santa Cruz [UCSC], Santa Cruz, California, U.S.A.)