A bayou is a slow-moving, marshy stream found mainly in the flat, low-lying areas of the southern United States, especially Louisiana and Mississippi. Picture a body of water that's somewhere between a lazy river and a swamp: the water barely seems to flow, thick vegetation grows along the banks and sometimes right out of the water, and cypress trees draped with Spanish moss create shady, mysterious corridors.

Bayous form in places where the land is so flat that water can't decide which way to drain. They often connect rivers to lakes, or they branch off from rivers during floods and never quite find their way back. The water in a bayou is usually murky and brown, stained by decomposing leaves and plants. Fish, turtles, herons, and alligators thrive in these rich ecosystems.

Bayous have shaped the culture and history of the Deep South. People built homes along bayous, used them for transportation and fishing, and developed unique ways of life adapted to these watery landscapes. The famous bayous of Louisiana remain vital to the region's identity, ecology, and economy.