Antonio de Vea expedition enters San Rafael Lake in western Patagonia.

The Antonio de Vea expedition of 1675–1676 was a Spanish naval expedition to the fjords and channels of Patagonia aimed to find whether rival colonial powers—specifically, the English—were active in the region. While this was not the first Spanish expedition to the region, it was the largest up to then, involving 256 men, one ocean-going ship, two long boats and nine dalcas. The expedition dispelled suspicion about English bases in Patagonia. Spanish authorities' knowledge of western Patagonia was greatly improved by the expedition, yet Spanish interest in the area waned thereafter until the 1740s.

San Rafael Lake is an arc-shaped coastal lake located in the Aysén del General Carlos Ibáñez del Campo Region of Chile, within the national park that bears its name. To the north the lagoon is connected to the Moraleda Channel, to the south lies the Ofqui Isthmus. To the west and east lie the Taitao Peninsula and the Northern Patagonian Ice Field respectively.

December 11 is the 345th day of the year in the Gregorian calendar; 20 days remain until the end of the year.