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Every U.S. State Border River

There are 57 distinct rivers that help form the natural and legal borders of each contiguous state in the United States. Try and guess them all. There are several pairs of rivers that share the same name.
The length provided is what constitutes that river's share of the border, not the river as a whole.
States or provinces highlighted in red form international boundaries.
Sources: Google Maps and Wikipedia
Quiz by
charlevoix
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Last updated: April 15, 2026
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First submittedDecember 15, 2025
Times taken259
Average score26.3%
Rating4.67
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State Borders
≈ Length (mi)
Answer
Mississippi
Louisiana
150
1232
Mississippi River
Arkansas
150
Tennessee
80
Kentucky
7
Missouri
40
Kentucky
50
Illinois
310
Iowa
220
Wisconsin
90
Minnesota
135
Kentucky
Indiana
345
920
Ohio River
Illinois
130
Ohio
175
West Virginia
270
Texas
Coahuila (MX)
330
875
Rio Grande
Chihuahua (MX)
290
Tamaulipas (MX)
240
Nuevo Leon (MX)
12
New Mexico
3
Texas
Oklahoma
460
515
Red River
Arkansas
55
Missouri
Kansas
125
470
Missouri River
Nebraska
60
Iowa
150
South Dakota
135
Virginia
Washington, D.C.
12
362
Potomac River
Maryland
160
West Virginia
190
Arizona
California
200
355
Colorado River
Nevada
135
Baja California (MX)
20
New Jersey
Delaware
40
280
Delaware River
Pennsylvania
160
New York
80
Idaho
Oregon
180
215
Snake River
Washington
35
New Hampshire
Vermont
190
190
Connecticut River
Connecticut
Massachussetts
<1
Georgia
Alabama
160
185
Chattahoochee River
Florida
25
Maine
New Brunswick (CA)
70
100
St. John River
Quebec (CA)
30
Minnesota
South Dakota
30
55
Bois de Sioux River
North Dakota
25
South Carolina
Georgia
35
35
Chattooga River
North Carolina
<1
Alabama
Mississippi
10
11
Tennessee River
Tennessee
1
Washington
Oregon
310
Columbia River
Indiana
Illinois
190
Wabash River
Louisiana
Texas
180
Sabine River
Mississippi
60
Pearl River
Florida
Georgia
95
St. Marys River
Alabama
65
Perdido River
Kentucky
West Virginia
65
Tug River
25
Big Sandy River
Georgia
South Carolina
230
Savannah River
40
Tugaloo River
North Carolina
9
Catawba River
Iowa
South Dakota
80
Big Sioux River
Minnesota
25
Minnesota River
North Dakota
210
Red River
Ontario (CA)
85
Rainy River
45
Pigeon River
5
Pine River
5
Basswood River
5
Granite River
3
Arrow River
Wisconsin
120
St. Croix River
25
St. Louis River
Michigan
115
Menominee River
35
Brule River
30
Montreal River
Ontario (CA)
60
St. Marys River
40
St. Clair River
25
Detroit River
New York
35
Niagara River
Quebec (CA)
110
St. Lawrence River
New Jersey
50
Hudson River
Vermont
20
Poultney River
Connecticut
2
Byram River
Rhode Island
10
Pawcatuck River
Massachusetts
3
Runnins River
Maine
New Brunswick (CA)
110
St. Croix River
35
St. Francis River
New Hampshire
35
Salmon Falls River
10
Piscataqua River
Quebec (CA)
25
Halls River
Missouri
Arkansas
40
St. Francis River
Iowa
30
Des Moines River
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1 Comments
Eumenes
+2
Level 65
Apr 9, 2026
Nice quiz! Turns out I do not know that may rivers lol
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