Region
prev ...
Great Basin National Park
1
Great Basin National Park (Nev.)
1
Great Britain
2
Great Lakes (North America)
9
Great Lakes Watershed (North America)
1
Great Plains
2
Gulf Coast (U.S.)
7
Gulf States
2
Himalaya Mountains Region
4
Idaho
2
Illinois
1
Indian Ocean Region
3
Johnstown Flood National Memorial
1
Johnstown Flood National Memorial (Pa.)
1
Kansas
1
Kenosha County
1
Klamath River Watershed (Or. and Calif.)
2
Kobuk Valley National Park (Alaska)
1
Korean Demilitarized Zone (Korea)
1
Kruger National Park
1
Lake Borgne
2
Lake County
1
Lake Roosevelt National Recreation Area
1
Lake Roosevelt National Recreation Area (Wash.)
1
Lassen Volcanic National Park
1
Lassen Volcanic National Park (Calif.)
1
Lava Beds National Monument
1
Lava Beds National Monument (Calif.)
1
Lewis and Clark National Historical Park (Or. and Wash.)
1
Long Island Sound (N.Y. and Conn.)
7
Los Angeles River
1
Los Angeles River (Calif.)
1
Louisiana
3
Madrean Archipelago
1
Maldives
1
Maryland
1
Mexico, Gulf of
2
Michigan, Lake
1
Middle Atlantic States
1
Middle West
1
Minnesota
1
Mississippi River-Gulf Outlet Canal
3
Mississippi River-Gulf Outlet Canal (La.)
3
Missouri
1
Missouri River
1
Missouri River Watershed
1
Montana
2
Mount Rainier National Park
1
Mount Rainier National Park (Wash.)
1
Nevada
4
more ...