Mexico–United States border
The Mexico–United States border is an international border separating Mexico and the United States, extending from the Pacific Ocean in the west to the Gulf of Mexico in the east. The border traverses a variety of terrains, ranging from urban areas to deserts. The Mexico–U.S. border is the most frequently crossed border in the world with approximately 350 million documented crossings annually. It is the tenth-longest border between two countries in the world.
The vast majority of the current border was decided after the Mexican–American War (1846–1848). Most of the border is settled on the Rio Grande River on the border of Texas and northeastern Mexico. To the left lies San Diego, California and on the right is Tijuana, Baja California. The building in the foreground on the San Diego side is a sewage treatment plant built to clean the Tijuana River.
U.S. Border Patrol at Algodones Sand Dunes, California. The fence on the U.S.–Mexican border is a special construction of narrow, 4.6 m (15 ft) tall elements, that are movable vertically. This way, they can be lifted on top of the ever shifting sand dunes.
Border Patrol patrolling the Rio Grande in an airboat in Laredo, Texas
The start of the border fence in the state of New Mexico – just west of El Paso, Texas
Borders are usually defined as geographical boundaries, imposed either by features such as oceans and terrain, or by political entities such as governments, sovereign states, federated states, and other subnational entities. Political borders can be established through warfare, colonization, or mutual agreements between the political entities that reside in those areas.
North Korean policemen standing guard at the North Korea-South Korea border. View from North Korea.
A photograph of the France–Italy border at night. The southwestern end of the Alps separates the two countries.
The purpose of the Great Wall of China was to stop people and militaries from crossing the northern border of China. Today it is a relic border.
Crossing the Ambassador Bridge into Canada from the US