The California-Mexico border is a 1,954-mile international boundary that separates the United States and Mexico. It runs from the Pacific Ocean in the west to the Gulf of Mexico in the east, with the California section measuring about 140 miles. This border is significant for trade, culture, and immigration between the two countries. The border features several entry points, including major crossings like San Ysidro and Otay Mesa. It is also marked by various security measures, including fences and patrols, aimed at managing the flow of people and goods. The region is known for its diverse communities and economic ties.