An amazingly accurate calendar--the modern world didn't surpass it in accuracy until the 1960s.
Architecture and astronomy--
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The Bay Campeche was the body of water that did not border the Mayan Empire
what is the size of the Incas empire
The Mayan did have an irragation system. Look up terrace farming.
Mayan kings were the centers of power for Mayan civilization. Each Mayan city- state was controlled by a dynasty of kings, who collectively drove the empire forward.
The Aztec and Mayan empires did.