The XI Aysén del General Carlos Ibáñez del Campo Region (Spanish: Región de Aysén or XI Región Aysén del General Carlos Ibáñez del Campo), often shortened to Aysén Region or Aisén (Pronounced: ), is one of Chile's 15 first order administrative divisions. Although the third largest in area, the region is Chile's most sparsely populated region with a population of 100,417 as of 2002. The capital of the region is Coihaique, the region's former namesake.
The Aysén Region is the least populous of Chile's fifteen regions. The landscape is marked by several glaciations that formed many lakes, channels and fjords. The region still contains icefields including the Northern Patagonian Ice Field and the Southern Patagonian Ice Field, the world's third largest after those in Antarctica and Greenland. Laguna San Rafael National Park, reachable only by boat or plane, is one of the region's most popular tourist destinations. Until the construction of Route 7 (the Carretera Austral, or Southern Highway) in the 1980s, the only overland routes from north to south through the region were extremely primitive tracks.