Lake San Martin is located on the territory of the Argentine state of Santa Cruz. It is on the list of the 10 largest lakes in the world and is the deepest on the South American continent. The lake is located on the border of Argentina and Chile. His part in Argentina was named in honor of the national hero in the fight for independence, josé de San Martin. Its total area is about 1010 meters, depth is 836 meters. In its form it is rough and has 8 sleeves. In the lake empties into the river Mayer and several streams and one river flows out – Pascua. Also in the lake flowing in two glacier O'higgins and Chico.

San Martin is surrounded by the beautiful scenery of the pampas and the chain of snowy peaks. Local flora and fauna is rich and fascinating. Here there are more than hundred species of animals and birds.

Lake San Martin is known for its clear waters. The water color varies from blue to green. It is home to a large number of trout. In this regard, on the banks of the fans of the sport fishing often hold competitions.

The tourist centre of the district is the small town of El Chalten. It has everything for a comfortable stay: campgrounds, souvenir shops, information center, travel Agency. Tour includes excursions to different parts of San Martin: walking on water, walking tours around the lake for fans of eco-tourism, fans of extreme rest will see spectacular snow-capped peaks of the Andes.

Individual landmark on the shore of lake San Martin is the estate of Nahuel Huapi. For guests there are organized horse riding tours on the estate.