Sierra Negra is one of the 5 active volcanoes that has the Isabela island; located to the south of it, is considered the second most active caldera's largest world with about 10km in diameter. This is the only volcano enabled to visit in the archipelago, starting from the south, then walk along the east side of the caldera, until you get to the northeast of the volcano, where it begins the descent to Chico Volcano, one of the largest craters hosted in the immediate vicinity of the Sierra Negra, in this area it's easy to find different fumaroles fully active from where emanates steam from the lava, quite apart from observing a single scenario that assimilates walk on the Moon.