Sombrero Chino and Sullivan Bay offer unique insights into the archipelago's volcanic origins. Sombrero Chino, a small islet near Santiago Island that is named for its hat-like shape, features young lava formations, sparse vegetation, and a thriving marine ecosystem. Sullivan Bay, on the eastern coast of Santiago Island, is renowned for its striking pahoehoe lava flows from an 1897 eruption, showcasing the barren landscape of recent volcanic activity.