Cát Hải is a rural district (huyện) of Hai Phong, the third largest city of Vietnam.

The district capital lies at Cát Bà [vi].

Vinfast is building an automobile factory on the southern half of the island,[3] and Sun Group is developing a holiday resort on the northern half.

A 5.44 km long bridge - the longest sea crossing in Vietnam - connects the island to Hai Phong.

This article about a location in Haiphong, Vietnam is a stub.