SIERRA NEGRA VOLCANO
This volcano at the southeastern end of Isabela has the largest caldera in diameter of any in Galápagos, measuring 10 km by 9 km. It is well worth a visit for the scenery, the volcanic activity and the vegetation. You may also be fortunate to come across a Giant Tortoise. Volcán Chico on the northeast side of the caldera is an area of fumaloric activity and to the west there is the "Mina de Azufre" or sulphure mine, where there is more fumaloric activity and sulphur deposits.