Kawai Nui Marsh is the largest remaining wetland in Hawaii, providing vital habitat for native waterbirds and offering a unique setting for nature observation.
Kawai Nui Marsh, located on the windward side of Oahu in Kailua, is the largest remaining freshwater wetland in Hawaii, covering approximately 830 acres. This ecological treasure is home to several endangered Hawaiian waterbird species, including the Hawaiian stilt ('aeʻo), Hawaiian coot ('alae ke'oke'o), and the Hawaiian moorhen ('alae 'ula). The marsh's significant role as a natural flood-control basin makes it a vital feature for the surrounding communities. Historically, the area was integral to Hawaiian agriculture and aquaculture, with early inhabitants cultivating taro in the wetlands. Today, Kawai Nui Marsh is a designated Ramsar Wetland of International Importance because of its rich biodiversity and cultural heritage. Visitors can enjoy birdwatching from designated viewing points and learn about the cultural and natural history of the area through guided tours and educational programs.
Birdwatching opportunities with rare Hawaiian waterbirds
Scenic view of the Ko'olau Mountain Range
Interpretive signs explaining the ecological and cultural significance
Guided educational tours about native flora and fauna
This wetland is one of the best places to observe the endangered Hawaiian stilt, a unique bird found only in Hawaii.
Educational signs along the trail provide information about the marsh's ecology and history.
The marsh offers stunning views of the Ko'olau Mountain Range, enhancing the scenic beauty of the area.