Sierra Madre del Sur

[ see-er-uh mah-drey del soo r; Spanish syer-ah mah-thre th el soor ]
/ siˈɛr ə ˈmɑ dreɪ dɛl ˈsʊər; Spanish ˈsyɛr ɑ ˈmɑ ðrɛ ðɛl ˈsur /

noun

a plateau mountain range in Guerrero and Oaxaca states, S Mexico. Highest peak 12,149 feet (3703 meters).