The
Acarai Mountains (also,
Akarai Mountains) (; ) are a wet, forested highland region of low
mountains located in the southern part of
Guyana. This range lies along the common border between Guyana and
Brazil. The Acarai Mountains is one of four mountain ranges in Guyana, the others being the
Imataka,
Kanuku and
Pakaraima mountains. The headwaters of the
Essequibo River, the longest river in Guyana, and the
Courantyne River, have their sources in this range.