Sarmiento Channel is a principal Patagonia channel, which extends in a north-south direction. It begins with the Guia Narrows (Angostura Guia) and is located in Magallanes y Antártica Chilena Region. The kawesqar people sailed its waters from around 6,000 years ago until end of 20th century, as they inhabited its coasts. The channel is named after Pedro Sarmiento de Gamboa, who was a Spanish explorer who navigated the region's waterways between 1579 and 1580.