The United States-Mexico Border is a 1,954-mile long international boundary that separates the United States from Mexico. It stretches from the Pacific Ocean in the west to the Gulf of Mexico in the east, passing through various terrains, including deserts, rivers, and urban areas. This border is significant for trade, culture, and immigration. It features several major crossings, such as the San Ysidro Port of Entry, which is one of the busiest land borders in the world. The border is also a focal point for discussions on immigration policy and security measures.