Santiago Astata is a town and municipality in Oaxaca in south-western Mexico.

[1] The municipality covers an area of 446.54 km² at an elevation of 30 metres above sea level.

Flora includes deciduous trees and shrubs such as passion fruit, cachimbo and mesquite.

[1] A few people speak the lowland version of Oaxacan Chontal, a language that is in danger of extinction.

[4] Economic activities include agriculture (beans, corn, sesame, sorghum, watermelon, cantaloupe, tomatoes and peanuts), animal husbandry (cattle, goats and pigs), harvesting the ocean for fish and shellfish for the Salina Cruz market, limestone quarrying and logging.