 The Sierra Chinanteca, north of the Sierra Juárez, are home to Chinantec towns including Santiago Comaltepec, San Pedro Yolóx.and San Felipe Usila.The Sierra Mixe are to the east, as the Sierra Madre de Oaxaca descends towards the Isthmus of Tehuantepec, lies t, home to the Mixe people, descendants of the Ancient Olmecs of Mexico's Gulf Coast.