Bartolomé Island (Spanish: Isla Bartolomé) is a volcanic islet in the Galápagos Islands group, just off the east coast of Santiago Island. It is one of the "younger" islands in the Galápagos archipelago. This island, and Sulivan Bay on Santiago island, are named after naturalist and lifelong friend of Charles Darwin, Sir Bartholomew James Sulivan, who was a lieutenant aboard HMS Beagle. Bartolomé has a volcanic cone that is easy to climb and provides great views of the other islands. Bartolomé is famous for its Pinnacle Rock, which is a distinctive characteristic of this island.