Puerto Chacabuco is a Chilean town in Aisén commune. Administratively it belongs to Aisén Province in Aisén Region and is located at the head of Aisén Fjord. It is the main port of the region, a port of call for ships sailing to the Laguna San Rafael National Park and the terminus of a Navimag ferry service from Puerto Montt. Before the great burnings of the Patagonian forests and the eruption of Mount Hudson volcano in 1991 Puerto Aisén was the main port in the Aisén Fjord, but the ashes and earth erosion decreased the navegability of Aisén River and the port had to be moved further to the coast where Puerto Chacabuco now stands. Puerto Chacabuco is named after the Battle of Chacabuco in 1817 during the Chilean Independence War.