The Harold L. Lyon Arboretum, University of Hawaiʻi at Mānoa, is the only university botanical garden located in a tropical rainforest in the U.S. It is also the only easily accessible tropical rainforest on Oʻahu.
The arboretum occupies nearly 200 acres at the top of the Mānoa watershed. It has a set of small cottages and greenhouses that are used for research and community education about plants and the natural environments of Hawaiʻi.
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