Cuilapan/Cuyolapan/Plain of the Cacaxtli (Carrying Rack)
Sa'a Yucu

coyol-li:  bell
apan-tli:  canal, river
“River of the Bell”

sa'a:  at the foot of
yucu:  hill, mountain
"at the foot of the mountain" 

Maarten Jansen, “Nombres históricos e identidad etnica en los códices mixtecos,” Revista Europea de Estudios Latinoamericanos y del Caribe  47 (1989).

Mary Elizabeth Smith, Picture Writing in Ancient Southern Mexico: Mixtec Place Signs and Maps, Civilization of the American Indian Series 124 (Norman: University of Oklahoma Press, 1973) 64-65.

Codex Selden, page 13.