Tabasco Plain, tropical lowland on the Gulf of Mexico, in Tabasco state, southeastern Mexico. Occupying the coastal lowlands south of the Isthmus of Tehuantepec and north of the Yucatán Peninsula, the Tabasco Plain is made up of alluvial materials deposited by the Grijalva and Usumacinta rivers and is covered with dense, tropical forest. The climate is hot and humid, rainfall is heavy, and lagoons and swamps are common on the low-lying delta lands, where annual floods inundate enormous areas.
The fertile soil of the plain yields crops of bananas, coconuts, cacao, coffee, and sugarcane; various hardwoods are processed. The discovery of abundant reserves of oil in the late 1970s brought a significant influx of people to the once sparsely populated region.
The Tabasco Plain was part of the area within the trading network of the Olmec people between 1100 and 800 bce. Their cultural influence had great impact on succeeding peoples (mainly Maya) who settled on the plain. The first Europeans to enter the region were Juan de Grijalva (1518) and Hernán Cortés (1519), but control was not wrested from the Maya by the Spanish for another 20 years and only after bitter fighting. The Tabasco Plain was the scene of more fighting during Mexico’s war with France in the 1860s. Lowland areas are still inhabited by descendants of the Chontal Maya.