Ameca (ah-MAI-kah), city (1990 pop. 30,882) and township, Jalisco state, W Mexico, at W end of Transverse Volcanic Axis, on Ameca R., 45 mi/72 km WSW of Guadalajara; 20°34'N 104°03'W. Elev. 4,052 ft/1,235 m. Agr. center (grain, sugar, chickpeas, beans, alfalfa); tanning.