sentences:  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 navigability 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 corvette "Chacabuco" with which Enrique Simpson explored the fjords and archipelagoes of Aysén Region in the 1870s.