Mangrove Island
| Basic: |
| A mangrove island is a type of island and mangrove swamp. |
| Documentation: |
| Comment: A sub-collection of Island . Each instance of #$MangroveIsland is a swampy island, surrounded by a body of water, and occupied by #$MangroveTrees. |
| Structure: |
| Every mangrove island has some group of mangrove trees as a physical decomposition. |