Mexico Mexico, the United Mexican States (Estados Unidos Mexicanos), is bordered on the north by the United States of America; on the south by Belize and Guatemala; on the east by the United States of America, Gulf of Mexico, and the Caribbean Sea; and on the west by the Pacific Ocean. Mexico's borders stretch approximately 1,958,201 square kilometers or 756,066 square miles. That figure includes 5,363 square kilometers or 2,071 square miles of outlying islands. From north to south its longest distance is 1,250 miles. From east to west its longest distance is 1,900 miles. Mexico's coast line covers about 6,320 miles. Most of Mexico is just an immense elevated plateau, flanked by mountain ranges that