amilpampa.

toward the agricultural fields with irrigation, acuatic plantings; also seems to have an association with "south" (likely given that the chinampa agriculture was in the southern part of the capital city)
Miguel León-Portilla, "Un testimonio de Sahagún aprovechado por Chimalpahin," Estudios de Cultura Nahuatl 14 (1980), 95–129; see pp. 120–121.