What is Bayou?

Legal Definition
In usage in the United States, a bayou (/ˈb./ or /ˈb./, from Cajun French) is a body of water typically found in a flat, low-lying area, and can be either an extremely slow-moving stream or river (often with a poorly defined shoreline), or a marshy lake or wetland. The name "bayou" can also refer to a creek whose current reverses daily due to tides and which contains brackish water highly conducive to fish life and plankton. Bayous are commonly found in the Gulf Coast region of the southern United States, notably the Mississippi River Delta, with the states of Louisiana and Texas being famous for them. A bayou is frequently an anabranch or minor braid of a braided channel that is moving much more slowly than the mainstem, often becoming boggy and stagnant. Though fauna varies by region, many bayous are home to crawfish, certain species of shrimp, other shellfish, catfish, frogs, toads, American alligators, American crocodiles, herons, turtles, spoonbills, snakes, leeches, and a myriad of other species.
-- Wikipedia
Legal Definition
A species of creek or stream common in Louisiana and Texas. An outlet from a swamp, pond or lagoon, to a river or the sea. See Surgett v. Lapice, 8 How. 48, 70, 12 In Ed. 982.
-- Black's Law Dictionary