Koa- Acacia | Location: Kona Hema Preserve, in south Kona  | Height: 115 ft | Circumference: 343.3 in | Crown Spread: 93.3 ft | Points: 466.3  | Current Ranking: National Champion   | The Kona Hema Preserve is managed by The Nature Conservancy and is not open to the public. The Conservancy&#039;s Kona Hema Preserve (8,089 acres) protects part of an ancient koa-`ōhi`a forest that spans more than 100,000 acres along the leeward coast of the Island of Hawai`i.