Like many ancient land areas, it extended from the northern slopes of Haleakala to the sea-level Pe'ahi gultch. It also lent its name to a reservoir formed by a dam across the Uaoa Stream. The name Pe'ahi means "wave" in the Hawaiian language, in the sense of a fanning or beckoning motion of the hand.
Much of the land is owned by Alexander & Baldwin, formerly leased for agriculture to Maui Pineapple Company (until it went out of business in 2009).
Source: Wikipedia, Facebook: Ocean Defender