San Quintín Glacier, Glacier in Laguna San Rafael National Park, Aysén Region, Chile

San Quintín Glacier, also called San Tadeo, is the largest glacier flowing out of the Northern Patagonian Ice Field. It flows west and its front forms a piedmont lobe that leaves the mountain and curves like a large alluvial fan across the Istmo de Ofqui, which links the Taitao Peninsula to the mainland. Its front lies 20 km southwest of San Rafael Glacier and 100 km east of the Tres Montes Peninsula, from which it is separated by the Gulf of Penas.

Space missions documented the glacier through photographs taken by STS-068 crew in 1994 and images captured from the International Space Station in 2002. These records show long-term changes in the ice over decades.

The glacier is also called San Tadeo, and its name recalls the Spanish saint Quintín. It lies within Laguna San Rafael National Park, and its western front feeds a proglacial lake formed as the ice retreated. Charles Darwin visited it in 1834 during the Beagle voyage, the first recorded visit.

Access requires careful planning and proper equipment due to the remote location and changeable Patagonian weather conditions. Visitors should prepare for rapid weather shifts and challenging approach routes.

The glacier's retreat has formed a proglacial lake at its front, a change confirmed by a new measurement in 2002. The glacier is also known as San Tadeo, and its front lies about 20 km southwest of the San Rafael Glacier.