They built Watson Brake, a series of mounds about 25 feet tall, near the river.
Social Studies · Middle School · Thu Jan 21 2021
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Watson Brake is an archaeological site in present-day Ouachita Parish, Louisiana, consisting of eleven ancient mounds and a central plaza. These mounds are not quite as tall as you mentioned; the largest one is about 25 feet (7.6 meters) tall, but others are smaller. Watson Brake is considered to be one of the oldest mound complexes in North America, with estimates dating its construction as far back as 3400 B.C. The mounds are located near the Ouachita River, which is part of the Mississippi River watershed.