Galicia is a region in northwestern Spain with over 1500 km of coastline on the Atlantic Ocean and Cantabrian Sea. It has a mild, rainy climate influenced by the seas. The most notable geographical features are its rias, which are coastal inlets formed by drowned river valleys along the coast. The rias support important fishing and aquaculture industries, with over 190 species captured commercially, including octopus, clams, and various fish. Rivers in Galicia, notably the Miño and Sil, provide hydroelectric power and have been important for transportation, irrigation, and human water supply through dams and other infrastructure.