This range lies along the common border between Guyana and Brazil.

[2] The mountain range was first mentioned in 1821 by A.H. Brué as Sierra do Acaray.

[1] This range is home to a single village of Wai-Wais, the descendants of surviving tribes that were once believed extinct.

[3] The unnamed high point of this range is located at 1°22′N 59°11′W / 1.367°N 59.183°W / 1.367; -59.183, and has an altitude of 1,009 metres (3,310 ft).

This range extends to the east, where it becomes the Tumuk Humak Mountains along the border of Suriname and French Guiana with Brazil.