Black Bayou is a 66.6 miles (107.2 km) river in Texas

Texas

Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...

 and Louisiana

Louisiana

Louisiana is a state located in the southern region of the United States of America. Its capital is Baton Rouge and largest city is New Orleans. Louisiana is the only state in the U.S. with political subdivisions termed parishes, which are local governments equivalent to counties...

. It is a tributary of Twelvemile Bayou, which feeds Cross Bayou

Cross Bayou

Cross Bayou is a river in Texas and Louisiana. It is a tributary of the Red River, part of the Mississippi River watershed.It rises in southeastern Harrison County, Texas, southeast of Marshall, and flows east into Caddo Parish, Louisiana...

 and consequently the Red River and the Mississippi River

Mississippi River

The Mississippi River is the largest river system in North America. Flowing entirely in the United States, this river rises in western Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains...

. It rises in Cass County, Texas

Cass County, Texas

As of the census of 2000, there were 30,438 people, 12,190 households, and 8,654 families residing in the county. The population density was 32 people per square mile . There were 13,890 housing units at an average density of 15 per square mile...

, 7 miles (11 km) north of Atlanta

Atlanta, Texas

Atlanta is a city in Cass County, Texas, United States. As of the 2000 census, the city had a total population of 5,745.-Geography:Atlanta is located at ....

, and flows south past Atlanta, then southeast into Caddo Parish, Louisiana

Caddo Parish, Louisiana

Caddo Parish is a parish located in the U.S. state of Louisiana. The parish seat is Shreveport; as of 2000, the population was 252,161...

. It continues southeast until reaching the Red River floodplain, then curves south and southwest to its confluence with the outlet of Caddo Lake

Caddo Lake

Caddo Lake is a lake and wetland located on the border between Texas and Louisiana, in northern Harrison County and southern Marion County in Texas and western Caddo Parish in Louisiana. The lake is named after the Southeastern culture of Native Americans called Caddoans or Caddo, who lived in...

, where Twelvemile Bayou is formed.