(bound form) used in historical names for Kinmen Island such as 浯洲 wú​zhōu or 浯江 wú​jiāng

(bound form) A small island in a river or a sandbar formed by silt deposits; also used for landforms like a 三角洲 sān​jiǎo​zhōu or 绿洲 lǜ​zhōu