Grays Lake National Wildlife Refuge is a 19,400 acres (79 km) wildlife refuge and largest hardstem bulrush marsh located in Bonneville County, Caribou County, Wayan, Idaho, United States, that was established in 1965.
19,400 acres (79 km) It has the largest hardstem bulrush marsh in North America. Bonneville County, Caribou County, Idaho, United States 1965 
