Mollendo is a town bordering the Pacific Ocean in southern Peru. It is located in the Arequipa Region and is the capital of both the Islay Province and the Mollendo District. Mollendo was the main port in the Peruvian southern coast until Matarani was developed about 50 years ago; the port of Mollendo only serves fishermen for the local economy currently and all the commercial shipping is done through Matarani 12 kilometers north; the old port is in ruins. Mollendo's population more than doubles during the summer, mostly from people from Arequipa.