The municipality covers an area of 446.54 km² at an elevation of 30 metres above sea level.
The climate is very warm.
Flora includes deciduous trees and shrubs such as passion fruit, cachimbo and mesquite.
Wild fauna consist of deer, rabbit, badger and wild boar.[1]
Climate
Climate data for Santiago Astata (1991–2020 normals, extremes 1979–present)
As of 2005, the municipality had a total population of 3,642 of whom 273 spoke an indigenous language.[1]
A few people speak the lowland version of Oaxacan Chontal, a language that is in danger of extinction.[4]
Economy
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.