Llust'a K'uchu (Aymara llust'a slippery, k'uchu, q'uch'u corner, Teodoro Marka M., Curso Basico de Lengua Aymara, Nociones Basicas de Lengua Aymara Ref Bertonio see: rincón and q'uch'u "slippery corner", hispanicized spelling Yustacucho) is a mountain in the Andes of southern Peru, about 4800 meters high.