What is the Missouri-Mississippi-Ohio River System?

The Missouri-Mississippi-Ohio River System is a major network of rivers in the United States that forms one of the largest river systems in North America. The Missouri River flows into the Mississippi River, which then merges with the Ohio River, creating a vital waterway for transportation, commerce, and ecology. This system plays a crucial role in draining a significant portion of the central United States and supports various ecosystems and habitats along its banks. Additionally, it has historical significance, having served as a key route for exploration and trade.