Part of the border between Iran and Iraq is defined by the parallel. In the United States, it defines part of the border between the states of Mississippi and Louisiana, and most of the border between Alabama and Florida.
Andrew Ellicott surveyed this parallel in 1797, when it was the border between the United States and Spanish territory.
Around the world
Starting at the Prime Meridian and heading eastwards, the parallel 31° north passes through:
Co-ordinates Country, territory or sea Notes Algeria Tunisia Libya Mediterranean Sea Gulf of Sidra Libya Egypt Mediterranean Sea Egypt Israel Jordan Saudi Arabia Iraq Iran / Iraq border Iran Afghanistan Pakistan Balochistan
People's Republic of China Tibet
Zhejiang - for about 5 km
Jiangsu - for about 5 km
Zhejiang - for about 11 km
East China Sea Japan Cape Sata, the southernmost point of the island of Kyūshū Pacific Ocean Mexico Baja California Gulf of California Mexico Sonora
United States Texas
Mississippi / Louisiana border
Alabama / Florida border
Atlantic Ocean Morocco Algeria