Itajaí can be found on the northern coast of the state. It is found on the banks of the river Rio Itajaí-Açu. The name of the city came from the name of the river. Itajaí has the cities Balneário Camboriú, Camboriú, Brusque, Gaspar, Ilhota and Navegantes next to it. Itajaí is found on the base Baixo Vale do Itajaí. It is next to the Atlantic Ocean. Itajai is pretty much built on a plain. Highway BR-101 is the main highway that passes by the city. Highways SC-100, SC-486, SC-470, and BR-470, connects Itajaí to the rest of the state.