Minas de Matahambre is a municipality and city in the Pinar del Río Province of Cuba. It was declared a National Monument of Cuba. The municipality faces the Gulf of Mexico to the north, where the cays of the Colorados Archipelago are developed off-shore. In 2004, the municipality of Minas de Matahambre had a population of 34,419. With a total area of 858 km (331 sq mi), it has a population density of 40.1 /km (104 /sq mi).