Popoi'a or Flat Island
Popoia is an offshore island close to the shore in Kailua Bay. It is a small and flat in shape thus its name. It is approximately 3.7 acres and the mximum elevation is only 10 feet above sea level and is made up of primarly limestone. There is also anchialine pools that are home to Hawaii's endemic red shrimp or 'opae.		  

 
 

Popoi'a is also a bird sanctuary that is home to nesting seabirds. The Bulwer's Petrel and Christmas Shearwater come here to breed. However, the island is a popular destination for kayakers and swimmers who land on the small beach area. Visitors should keep on the trails to prevent stepping on the burrows of nesting seabirds.

  
 
 
Popoi'a was once the location of an ancient Hawaiian fishing koa or heiau.

 

 

Popoi'a literally means rotted fish and may be named for the number of fishbones once found on the island. An ancient ko'a or fishing heiau was once located in the center of the island where fisherman gave an offering from their catch. A tidal wave destroyed most of the structure in 1946.

Of all the Kailua offshore islands, Popoi'a is home to the most native plants.
  Although Popoi'a has several native plant species the increase of alien species is due perhaps to landings by humans and non-native fruit eating birds. A recent survey shows that the numbers of native plants are decreasing. There is also the presence of the big-headed ants however their impact on the islands plants and animals is currently being researched.