Washington (State) 7
Colorado 6
California 5
Louisiana 5
Great Basin 4
Utah 4
Alabama 3
Arizona 3
Indiana 3
Mexico, Gulf of 3
Mississippi River Watershed 3
Nevada 3
North Carolina 3
Willapa Bay 3
Beaufort Sea 2
Chesapeake Bay (Md. and Va.) 2
Eastern Shore (Md. and Va.) 2
England 2
Florida 2
Front Range (Colo. and Wyo.) 2
Grand Canyon 2
Great Salt Lake 2
Howard County 2
Iceland 2
Kivalliq Region 2
Lava Falls Rapids (Ariz.) 2
Mackenzie 2
Massachusetts 2
Nebraska 2
New York (State) 2
North America 2
Northwest Territories 2
Nunavut 2
Oregon 2
Pacific Coast 2
Pamlico Sound 2
Pontchartrain, Lake, Watershed 2
Pontchartrain, Lake, Watershed (La.) 2
Rappahannock River 2
Rappahannock River Region 2
Texas 2
Transverse Ranges 2
Vincennes Region 2
Virginia 2
Wabash River Valley 2
Africa, West 1
Alaska 1
Antigua and Barbuda 1
Atlantic Coast (North America) 1
Australia 1
Baffin Bay (North Atlantic Ocean) 1
Bear Lake Watershed (Utah and Idaho) 1
Belize 1
Berkshire 1
Black Sea 1
Black Sea Coast 1
Black Sea Lowland 1
Canada, Northern 1
Cape Cod 1
Cape Cod Bay 1
Columbia River Estuary (Or. and Wash.) 1
Coos County 1
Coos County (Or.) 1
Denver 1
Denver Region 1
Devils Hole (Nev.) 1
Duwamish River Valley 1
El Salvador 1
Finger Lakes Region 1
Florida Keys 1
Galapagos Islands 1
Georgia 1
Gilpin County 1
Grand Canyon National Park 1
Grays Harbor 1
Greenland 1
Gulf Coast 1
Juab County 1
Klamath County 1
Las Vegas Valley 1
Lava Falls Rapids 1
MacLeod, Lake, Region (W.A.) 1
Marias River Valley 1
Marias River Valley (Mont.) 1
Medicine Lake Volcano 1
Medicine Lake Volcano (Calif.) 1
Mexico 1
Michigan, Lake, Watershed 1
Minnesota 1
Mobile Bay Watershed 1
Mobile Bay Watershed (Ala.) 1
Montana 1
Nares Strait 1
Nephi (Utah) 1
New England 1
New Mexico 1
North Atlantic Region 1
North Pacific Ocean 1
Olympic Peninsula 1
Onondaga Lake 1