The country directly south of the United States is Mexico. The two countries share a border that stretches approximately 1,954 miles (3,145 kilometers) from the Pacific Ocean to the Gulf of Mexico. This border is one of the most frequently crossed international boundaries in the world.
Mexico is located in the southern part of North America and is bordered by the United States to the north, Belize and Guatemala to the south, the Pacific Ocean to the west, and the Gulf of Mexico and the Caribbean Sea to the east. The border between the United States and Mexico is defined by the Rio Grande in the east and a series of markers and fences in the west.
This geographical proximity has led to significant cultural, economic, and political interactions between the two countries. Trade, tourism, and migration are some of the key areas where the relationship between the United States and Mexico is most evident.