Heredad de Aguas de Arucas y Firgas Historical milestone · Arucas, Gran Canaria - Área Metropolitana, Las Palmas Institution for allocating and administering irrigation water between Arucas and Firgas, with origins documented in 1505, which makes it one of the oldest water-management bodies (heredades de aguas) in the Canary Islands. The building that today houses it in Arucas was built in 1908. 1505 Photo: Teknad (CC0) What to see and do in Arucas