The Acre River (called Aquiry in the local Iñapari language; locally, Rio Acre) is a 650 kilometres (400 mi) long river in central South America
. The river is born in Peru
, and runs North-Eastwards, forming part of the border between Bolivia
. It runs through the Brazilian states of Acre and Amazonas
before eventually running into the Purus River. 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 60,000 square miles (160,000 sq km). It is navigable from the mouth until the Xapuri River (480 kilometres (300 mi)), even farther in the wet season from January until May. The river was an important transportation artery at the end of the 19th Century due to newly discovered rubber tree forests.