Located southeast of Santiago Island, Sullivan Bay is of great geological interest. The area is covered by Pahoehoe lava flows combined with A’A lava. It was very active 200 years ago. This flow is geologically very young. The magma formed is flat, but the movement of underground lava, the rapid cooling and other eruptions led to the break in many places.
| Highlights: | Pahoehoe lava flows, which have hardened in accordion like formation. Small glass-like bubbles of lava can be found, called "hornitos". Swimming with sea lions and other wildlife from the shore is a lovely way to finish off the tour. |
| Possible Activities: | Hike (1.3 mi / 1 1/2 km) swimming and snorkeling. |
| Type of Landing: | Dry landing |
| Difficulty: | Moderate |