Region
United States
4,438
California
721
West (U.S.)
301
Texas
240
Florida
237
Washington (State)
197
Arizona
196
Colorado
191
Oregon
187
New York (State)
168
Colorado River Watershed (Colo.-Mexico)
140
North America
137
Tennessee
137
New Mexico
127
England
126
Mississippi River Watershed
124
Idaho
118
Mexico, Gulf of
116
Minnesota
114
Hawaii
113
Nevada
111
Northeastern States
111
Columbia River Watershed
103
Pennsylvania
97
Wyoming
96
Kansas
93
China
92
Wisconsin
91
Louisiana
90
Montana
90
Great Lakes (North America)
85
North Carolina
85
Utah
83
New Jersey
81
Alaska
80
Pacific Coast
80
United States, West
79
Georgia
78
India
77
Colorado River (Colo.-Mexico)
75
Missouri River Watershed
75
Nebraska
67
Ohio River Watershed
67
Ohio
66
South Atlantic States
66
Arkansas
65
Saint Lawrence River Watershed
65
Great Basin
63
Great Britain
62
Massachusetts
62
more ...