San Lorenzo: massive Olmec capital built by hand without draft animals

August 30, 2026MexicoGeneralShare

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Key facts

• San Lorenzo stands on a ridge above the Coatzacoalcos River in southern Veracruz, Mexico.
• It was occupied by about 1800 BC and had emerged as an Olmec regional capital by around 1400 BC.
• Estimates put the earth moved to level and extend the site at 500,000 to 2 million cubic metres.
• A spring-fed system of U-shaped, stone-lined channels covered with slabs managed water beneath the site.
• Basalt came from the Tuxtla Mountains, roughly 50 to 150 km away across swamp and river.
• The Olmecs used neither draft animals nor wheeled transport; moving a midsized head required hundreds of workers over months.
• The largest known Olmec colossal head is San Lorenzo Monument 1, estimated at about 40 tons. La Cobata is a separate unfinished head weighing roughly 25 tons.
• At its peak, San Lorenzo covered about 690 hectares with an estimated 5,000 to 13,000 inhabitants.

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