Achí (Spanish pronunciation: [aˈtʃi]) is one of the 46 municipalities of the Bolívar department in the Caribbean Region of Colombia. It is crossed by the Cauca River and borders the Sucre department in the so-called Momposina Depression. The municipality of Achí is bordered by the municipality of Magangué to the north; the municipalities of Pinillos and Tiquisio to the east; the municipalities of Montecristo and San Jacinto del Cauca to the south; and the Sucre Department to the west with the municipalities of Majagual and Guaranda. Its economy is based on agriculture, livestock, and fishing.