Isla Partida is connected to Isla Espíritu Santo by a narrow isthmus. These two islands, in the Gulf of California, are protected by UNESCO as biospheres. They are located a short boat ride from La Paz, which lies on the Baja California Peninsula in Mexico. It has a land area of 15.495 km² (5.983 sq mi) and is part of the Municipality of La Paz in Baja California Sur.