Onelli Bay, Bay in Lago Argentino Department, Argentina

Onelli Bay is a bay on the Upsala arm of Lago Argentino in Los Glaciares National Park, Santa Cruz Province, Argentina. Its shore is covered by Patagonian forest of ñires, canelos and lengas, and from the shore of the Onelli lagoon there is a view of the confluence of the Onelli, Agassiz, Bolados and Heim glaciers. The water is grey and still, with dark rocks in the foreground and a field of pale blue and white ice slabs floating toward a low, wooded shoreline below snow-capped mountains.

The bay was formerly known as Puerto de las Vacas, after wild cattle that lived there. It now bears the name of Giacomo Onelli, an Italian-born Argentine explorer and naturalist who studied Patagonia. The bay lies within Los Glaciares National Park, created in 1937.

The bay is named after an Italian naturalist and draws visitors interested in glaciers and surrounding forests. It sits within a protected area dedicated to preserving the natural landscape.

The bay is best reached by boat tour departing from Puerto Bandera in El Calafate, which passes several other glaciers along the way. The journey offers good viewing points and allows you to observe the water systems up close.

The bay was formerly known as Puerto de las Vacas, "Harbour of the Cows", after wild cattle living there. Condors can be seen circling the mountains that border the Argentino Lake. The surrounding rainforest also holds mosses, lichens and ferns.