belle isle park, known simply as belle isle (), is a island park in detroit, michigan. it consists of belle isle, an island in the detroit river, as well as several surrounding islets. the u.s.-canada border is in the channel south of belle isle such that the island is not in canada. owned by the city of detroit, belle isle is managed as a state park by the michigan department of natural resources through a 30-year lease initiated in 2013; it was previously a city park. belle isle park is the largest city-owned island park in the united states, and belle isle is the third largest island in the detroit river, after grosse ile and fighting island. it is connected to mainland detroit by the macarthur bridge.