The geography of Mexico entails the physical an human geography of Mexico, a country situated in the Americas. Comprising much of southern North America or Middle America, Mexico is bounded to the north by the United States (specifically, from west to east, by California, Arizona, New Mexico, and Texas), to the west and south by the Pacific Ocean, to the east by the Gulf of Mexico, and to the southeast by Belize, Guatemala, and the Caribbean Sea. A northern constituent of Latin America, it is the most populous Spanish-speaking country in the world.