Cubulco is a small town, with a population of 10,681 (2018 census), located in the Guatemalan department of Baja Verapaz, at 15°6′30″N 90°37′50″W / 15.10833°N 90.63056°W. It serves as the administrative seat for the surrounding municipality of the same name. The municipality covers an area of 711 km² and has a population of 54,869 (2018).
The Achi are a Maya ethnic group in Guatemala. They live in various municipalities in the department of Baja Verapaz. The municipalities they live in are Cubulco, Rabinal, San Miguel Chicaj, Salamá, San Jerónimo, and Purulhá, in addition to parts of Granados and el Chol.
Achi (Achí in Spanish) is a Mayan language very closely related to Kʼicheʼ (Quiché in the older orthography). It is spoken by the Achi people, primarily in the department of Baja Verapaz in Guatemala.
There are two Achi dialects. Rabinal Achi is spoken in the Rabinal area, and Cubulco Achi is spoken in the Cubulco area west of Rabinal.