Zumarraga ([s̻umaraɣa]) is a municipality and industrial town in Gipuzkoa province of the Basque Country autonomous community of northern Spain, approximately 35 miles (56 km) by road southwest of San Sebastián and 10 miles (16 km) northwest of Idiazabal. As of 2018 the municipality had a population of 9834 people. The Urola river flows through the vicinity. It is the birthplace of Miguel López de Legazpi, conquistador who explored the Pacific Islands and the East Indies, and of Iñaki Urdangarín, the husband of Infanta Cristina of Spain.