Longest Straight-line International Borders

Name the longest straight-line international borders in the world.
Straight-line international borders greater that 270 kilometers long
Straight-line on a map
Quiz by srsharpe33
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Last updated: April 20, 2020
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First submittedApril 20, 2020
Times taken2,535
Average score88.6%
Rating4.95
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Border (km)
Country 1
Country 2
2057
Canada
United States
1040
Canada
United States
945
Mali
Mauritania
934
Chad
Libya
802
Egypt
Libya
749
Algeria
Mali
645
Egypt
Sudan
559
Egypt
Sudan
543
Algeria
Niger
476
Ethiopia
Somalia
457
Algeria
Mauritania
449
Angola
Namibia
429
Kenya
Tanzania
418
Chad
Sudan
411
Mali
Mauritania
410
Indonesia
Papua New Guinea
409
Kazakhstan
Uzbekistan
408
Morocco
Mauritania
408
Kenya
Somalia
407
Botswana
Namibia
374
Mexico
United States
271
Mexico
United States
+4
Level 49
Apr 20, 2020
Great quiz!
+2
Level 70
May 14, 2021
Nice!
+3
Level 62
May 14, 2021
Really interesting quiz idea, nominated!
+5
Level 67
May 14, 2021
Really good quiz, but I feel Saudi Arabia and Iraq and/or Yemen should be on this quiz.
+1
Level 53
Jan 14, 2023
yeah both are longer than the mexico/usa straight border
+1
Level 64
Jan 14, 2023
I'll check them out. Thanks
+3
Level 64
Jan 14, 2023
They are not completely straight lines. Iraq border is wavy. Oman border is three straight lines. I should specify this in the caveats.
+2
Level 67
May 14, 2021
Great quiz, a map version would probably be easier but still very fun
+3
Level 76
May 14, 2021
Great idea! Are you sure about the answers, might there be any missing?
+8
Level 69
May 14, 2021
Please accept Indonxcbswla for Indonesia so I can claim a perfect score. Easy spelling error; everyone makes it.
+1
Level 63
May 14, 2021
Yemen? Saudi Arabia? Oman? Iraq? Syria?
+2
Level 82
May 15, 2021
Amazing Idea for a quiz. Where are the two different straight-line borders between Egypt and Sudan?
+5
Level 62
May 19, 2021
It’s because there’s a tiny blip that strays from being one continuous straight line, so it counts as two: one either side of the blip.
+2
Level 60
Oct 3, 2021
I'm guessing it's where the Nile is.
+4
Level 85
Nov 23, 2021
The blip on the map is Bir Tawil -- a small area of land neither country claims as it related to a bigger land dispute.
+1
Level 70
Feb 28, 2024
It's actually a small notch in Sudan's border which extends north into Egypt, within the Aswan Resevoir.