Lehua Island is a small, crescent-shaped island in the Hawaiian islands, only 0.7 miles (1.1 km) north of Niʻihau, due west of Kauai. The uninhabited, 284-acre (1.15 km2) barren island is a tuff cone which is part of the extinct Niʻihau volcano.
Lehua was one of the first five islands sighted by Captain James Cook in 1778 which he spelled as "Oreehoua".
Lehua Island is a Hawaii State Wildlife Sanctuary. As a restricted sanctuary, all activities are prohibited on the island without a permit. Public access to the island is restricted to areas below the high tide water mark. Lehua provides habitat for at least 16 species of seabirds, as well as non-native Pacific rats. A population of European rabbits had lived on the island for many years but were removed in 2005.
When weather and wave conditions permit crossings from Kauai, Lehua is a noted destination for snorkeling and scuba diving. It is also well known for an unusual geological formation dubbed "the keyhole". Located in one of the crescent's narrow arms, this is a tall, thin notch cut from one side, all the way through to the other side of the arm.
- "Hawaii Wildlife Sanctuary Rules" (PDF). Hawaii Administrative Rules section 13-126. Hawaii Department of Land and Natural Resources. Retrieved 3 December 2015.
- "Final Environmental Assessment - Lehua Island Restoration" (PDF). Final Environmental Assessment - Lehua Island Restoration. Hawaii Office of Environmental Quality Control. Retrieved 3 December 2015.
- Hawaii Department of Land and Natural Resources. (12 January 2010). Rules Regulating Wildlife Sanctuaries (PDF). In, Hawaii Administrative Rules, § 13-126.
- Hawaiian Volcano Observatory. (29 September 1995). "Oʻahu, Niʻihau, and Kauaʻi". Volcano Watch.
- Light List, Volumes 1-7. United States Coast Guard. 2005.
- Lehua Island Ecosystem Restoration Project
- Final Environmental Assessment - Lehua Island Restoration (8 October 2005) 
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