See also: Flat Island (Falkland Islands).
| Flat Island | |
| Native Name: | 銀洲 |
| Native Name Link: | Chinese language |
| Map: | Hong Kong |
| Country Admin Divisions Title: | Districts |
Flat Island or Ngan Chau is an island located near the north shore of Sai Kung Peninsula of Hong Kong. It is at the mouth of in Hoi Ha Wan and the boundary of Hoi Ha Wan Marine Park .