Alegría is a municipality in the Usulután department of El Salvador. Located at approximately 1,200 meters above sea level, the municip…Alegría is a municipality in the Usulután department of El Salvador. Located at approximately 1,200 meters above sea level, the municipality's cool climate lends itself to many thriving local plant nurseries, some of which specialize in tropical flowers such as birds of paradise, anthuriums, orchids, and varieties of bromelias. The town is famous for its volcanic lake, the Alegría Laguna, which is a national protected area managed by the NGO ADESCAM. There is a local myth that a siren or mermaid lives in the lake, and that she will lure men who swim there to their deaths. Rural villages belonging to the municipality include El Zapotillo.