- 海岛市 hǎidǎoshì Municipality of the IslandsThe former Municipality of the Islands (Concelho das Ilhas) in Macau, encompassing the islands of Taipa and Coloane
- 海岛棉 hǎidǎomián Sea Island cottonA type of cotton plant known for its long, strong, and high-quality fibers used to spin fine yarn; it grows as an annual herb or perennial shrub with yellow flowers and palm-shaped leaves.