Chiapas (Spanish pronunciation: [ˈtʃjapas]), officially Free and Sovereign State of Chiapas (Spanish: Estado Libre y Soberano de Chiapas), is one of the 31 states that, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 118 municipalities and its capital city is Tuxtla Gutierrez. Other important cites in Chiapas include San Cristóbal de las Casas, Comitán, and Tapachula. Located in Southwestern Mexico, it is the southernmost State of Mexico. It is bordered by the states of Tabasco to the north, Veracruz to the northwest and Oaxaca to the west. To the east Chiapas borders Guatemala, and to the south the Pacific Ocean.

In general, Chiapas has a humid, tropical climate. In the north, in the area bordering Tabasco, near Teapa, rainfall can average more than 3,000 mm (120 in) per year. In the past, natural vegetation at this region was lowland, tall perennial rainforest, but this vegetation has been destroyed almost completely to give way to agriculture and ranching. Rainfall decreases moving towards the Pacific Ocean, but it is still abundant enough to allow the farming of bananas and many other tropical crops near Tapachula. On the several parallel "sierras" or mountain ranges running along the center of Chiapas, climate can be quite temperate and foggy, allowing the development of cloud forests like those of the Reserva de la Biosfera el Triunfo, home to a handful of Resplendent Quetzals and Horned Guans.