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Olmec Head No. 3 from San Lorenzo Tenochtitlan 1200–900 BCE

El Señor de las Limas, Xalapa Museum

Olmec jadeite mask 1000–600 BCE
The Olmecs (/ˈɒlmɛks, ˈoʊl-/) were the earliest known major Mesoamerican civilization. Following a progressive development in Soconusco, they occupied the tropical lowlands of the modern-day Mexican states of Veracruz and Tabasco. It has been speculated that the Olmecs derived in part from the neighboring Mokaya or Mixe–Zoque cultures.
The Olmecs flourished during Mesoamerica‘s formative period, dating roughly from as early as 1500 BCE to about 400 BCE. Pre-Olmec cultures had flourished since about 2500 BCE, but by 1600–1500 BCE, early Olmec culture had emerged, centered on the San Lorenzo Tenochtitlán site near the coast in southeast Veracruz.[1] They were the first Mesoamerican civilization, and laid many of the foundations for the civilizations that followed.[2] Among other “firsts”, the Olmec appeared to practice ritual bloodletting and played the Mesoamerican ballgame, hallmarks of nearly all subsequent Mesoamerican societies. The aspect of the Olmecs most familiar now is their artwork, particularly the aptly named “colossal heads“.[3] The Olmec civilization was first defined through artifacts which collectors purchased on the pre-Columbian art market in the late 19th century and early 20th century. Olmec artworks are considered among ancient America’s most striking.[4]
Etymology
The name ‘Olmec’ comes from the Nahuatl word for the Olmecs: Ōlmēcatl [oːlˈmeːkat͡ɬ] (singular) or Ōlmēcah [oːlˈmeːkaʔ] (plural). This word is composed of the two words ōlli [ˈoːlːi], meaning “rubber”, and mēcatl [ˈmeːkat͡ɬ], meaning “people”, so the word means “rubber people”.[5][6] Rubber was an important part of the ancient Mesoamerican ballgame.
Overview

The Olmec heartland, where the Olmec reigned from 1400 to 400 BCE
The Olmec heartland is the area in the Gulf lowlands where it expanded after early development in Soconusco, Veracruz. This area is characterized by swampy lowlands punctuated by low hills, ridges, and volcanoes. The Tuxtlas Mountains rise sharply in the north, along the Gulf of Mexico’s Bay of Campeche. Here, the Olmec constructed permanent city-temple complexes at San Lorenzo Tenochtitlán, La Venta, Tres Zapotes, and Laguna de los Cerros. In this region, the first Mesoamerican civilization emerged and reigned from c. 1400–400 BCE.[7]
More at: https://en.wikipedia.org/wiki/Olmecs