Bahia Ensenada Zaratiegui is a coastal bay on the Beagle Channel within Tierra del Fuego National Park in Argentina. It is a saltwater cove where mountains, forest, and sea converge. The bay is accessible via National Route 3, with a crossroads near the park entrance leading to it, as well as to Cañadón del Toro and Bahia Lapataia. The area is a known starting point for the Senda Costera coastal hiking trail, suggesting potential for shore access. The bay is noted for its aesthetic, combining dramatic mountain and forest scenery with marine waters. A point of significant cultural interest is the location of the world's most southern post office on its shore. The overall character is one of remote, sub-Antarctic wilderness. Paddling in the adjacent Lago Acigami (Lago Roca) is offered by some agencies, indicating that organized water activities occur within the broader park area. Given its location on the Beagle Channel, paddlers must anticipate significant exposure to the open ocean's wind, fetch, and potential for strong currents and boat traffic, requiring advanced planning for tides and conditions. The water is cold year-round, consistent with the Patagonian climate.