Its creation the result of volcanic activity, some of O'ahu's most celebrated natural landmarks testify to its hotspot origins—Diamond Head and Halona Blowhole, for example, were formed through volcanism. Other sites, such as Mānoa Falls and the Toilet Bowl, emphasize the island's powerful water connection. Still other locations point to O'ahu's settlement by the ancient Hawaiians, among them the Moli'i Fishpond and the Kukaniloko Birthstones.
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- A Nu'uanu Pali Lookout
- B Tantalus
- C Crouching Lion
- D Toilet Bowl
- E Ancient Fishponds
- F Kukaniloko Birthstones State Historic Site
