The Acre River (called Aquiry in the local Iñapari language; locally, Rio Acre) is a long river in central South America. The river is born in Peru, and runs North-Eastwards, forming part of the border between Bolivia and Brazil. It runs through the Brazilian states of Acre and Amazonas before eventually running into the Purus River at Boca do Acre. It boards on the Bolivian frontier and flows Easter and North to a junction with the Purus at 8° 45' South latitude. The name is also applied to a district situated on the same river and on the former boundary line of 1867, between Bolivia and Brazil. This region's area is estimated at about .