A tributary is a gated passageway used to raise or lower boats in a waterway

A tributary is a small river that flows into a larger river

A lock is a gated passageway used to raise or lower boats in a waterway

A levee is a raised riverbank used to control flooding. New Orleans has these.

A fall line is a flat lowland along a coast

A coastal plain is a flat lowland along a coast

A fall line is an area where waterfalls flow from higher to lower ground

A hurricane is a storm with strong winds and heavy rains

The Southeast US is a subregion.

The Great Lakes are a cluster of 10 lakes located in the Midwest

and central Canada

The Mississippi is one of the longest rivers in North America. It runs south from Minnesota to the Gulf of Mexico.