Caldera de los Marteles (Valsequillo) Nature · Valsequillo de Gran Canaria, Gran Canaria - Centro-Norte, Las Palmas The municipality of Valsequillo shares with Telde, Ingenio, Agüimes, Santa Lucía de Tirajana and San Bartolomé de Tirajana the Los Marteles Special Nature Reserve, declared on 16 November 1994 around this volcanic crater in the Gran Canaria highlands. 16 de noviembre de 1994 Photo: LBM1948 (CC BY-SA 4.0) What to see and do in Valsequillo de Gran Canaria