Araçuaí (Portuguese pronunciation: [aɾɐswa'i]) is a Brazilian municipality located in the northeast of the state of Minas Gerais in the Jequitinhonha River valley. The Araçuaí River, a tributary of the Jequitinhonha, flows through it. Its population as of 2020 was estimated to be 36,712 people living in a total area of 2,235 km2. The city belongs to the mesoregion of Jequitinhonha and the microregion of Araçuaí. The city is the seat of the Roman Catholic Diocese of Araçuaí. The elevation of the municipal seat is 307 meters. It became a municipality in 1870. Between the municipalities of Araçuaí and Itinga is located the largest lithium mine in Brazil, explored and extracted by Sigma Lithium Resources.