Answer the following question: Information: - A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as stream, creek, brook, rivulet, and rill. There are no official definitions for the generic term river as applied to geographic features, although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in some parts of the United States, "burn" in Scotland and northeast England, and "beck" in northern England. Sometimes a river is defined as being larger than a creek, but not always: the language is vague. - "Main Stem" is 1942 instrumental by Duke Ellington and His Famous Orchestra. Although recorded in 1942, the single would not be released until 1944 where it was Duke Ellington's last of four number one's on the Harlem Hit Parade. "Main Stem" also peaked at number twenty on the pop chart. - The Red River , or sometimes the Red River of the South , is a major tributary of the Mississippi and Atchafalaya rivers in the southern United States of America . The river was named for the red - bed country of its watershed . It is one of several rivers with that name . '' The Mexicans and Indians on the borders of Mexico are in the habit of calling any river , the waters of which have a red appearance , ' Rio Colorado ' , or Red river '' , observed R.B. Marcy in 1853 . The Red River formed part of the US - Mexico border from the Adams - Onis Treaty ( in force 1821 ) until the Texas Annexation and the Treaty of Guadalupe Hidalgo . The Red River is the second - largest river basin in the southern Great Plains . It rises in two branches ( forks ) in the Texas Panhandle and flows east , where it acts as the border between the states of Texas and Oklahoma . It forms a short border between Texas and Arkansas before entering Arkansas , turning south near Fulton , Arkansas and flowing into Louisiana , where it flows into the Atchafalaya River . The total length of the river is 1,360 miles ( 2,190 km ) , with a mean flow of over 57,000 cubic feet per second ( 1,600 m3 / s ) at the mouth . - A tributary or affluent is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainage basin of its surface water and groundwater, leading the water out into an ocean. - A drainage basin or catchment basin is an extent or an area of land where all surface water from rain, melting snow, or ice converges to a single point at a lower elevation, usually the exit of the basin, where the waters join another body of water, such as a river, lake, reservoir, estuary, wetland, sea, or ocean. Thus if a tributary stream joins a brook that in turn joins a small river which is a tributary of a larger river, there is a series of successively larger (and lower elevation) drainage basins. For instance, the Missouri and Ohio rivers are within their own drainage basins and also within the drainage basin of the Mississippi River. After reading the paragraphs above, we are interested in knowing the entity with which 'red river of the south' exhibits the relationship of 'mouth of the watercourse'. Find the answer from the choices below. Choices: - main - mississippi river - sea
Answer:
mississippi river