Buenaventura is one of the 67 municipalities of Chihuahua, in northern Mexico. The municipal seat lies at San Buenaventura. The municipali…Buenaventura is one of the 67 municipalities of Chihuahua, in northern Mexico. The municipal seat lies at San Buenaventura. The municipality covers an area of 8,938.3 km. As of 2010, the municipality had a total population of 22,378, up from 20,533 as of 2005.