Question: Terlingua Creek is a stream in the U.S. state of Texas, it is a tributary of which one of the principal rivers in the southwest United States and northern Mexico (the other being the Colorado River), and begins in south-central Colorado in the United States and flows to the Gulf of Mexico?
Context: The Rio Grande ( or ; Spanish: Río Bravo del Norte , ] or simply Río Bravo) is one of the principal rivers in the southwest United States and northern Mexico (the other being the Colorado River).  The Rio Grande begins in south-central Colorado in the United States and flows to the Gulf of Mexico.  Along the way, it forms part of the Mexico–United States border.  According to the International Boundary and Water Commission, its total length was 1896 mi in the late 1980s, though course shifts occasionally result in length changes.  Depending on how it is measured, the Rio Grande is either the fourth- or fifth-longest river system in North America. Onion Creek is a small tributary stream of the Colorado River in Texas.  It begins 12 mi southeast of Johnson City, Blanco County, Texas, and flows approximately 79 mi eastward into the Colorado River, 2 mi northwest of Garfield in Travis County, Texas.  While areas surrounding the creek's origin in Blanco County are primarily rural, areas closer to its mouth in Travis County have more urban and industrial development.  Passing near Dripping Springs, Driftwood, and Onion Creek, Onion Creek is the source of the waterfalls in McKinney Falls State Park.  Onion Creek's watershed spans an area of 211 mi2 Nancy Creek is a 16.3 mi stream in northern Atlanta, Georgia, United States.  It begins in far northern DeKalb County, just north of Chamblee, and flows southwestward into Fulton County, through the far southeast corner of Sandy Springs, then through the Buckhead area of Atlanta.  It empties into Peachtree Creek, which then flows into the Chattahoochee River, south of Vinings and Paces.  The Chattahoochee eventually joins with the Flint River to create the Apalachicola River, which flows into the Gulf of Mexico.  The North Fork Nancy Creek is a major tributary, while Little Nancy Creek tends to run low or dry.  Other tributaries include Bubbling Creek which originates in Chamblee, Perimeter Creek which originates in Dunwoody and Silver Creek which includes the 38-acre Silver Lake and Little Silver Lake. The U.S State of Colorado includes the headwaters of several important rivers.  The state is divided into two major hydrographic regions by the Continental Divide of the Americas.  East of the Continental Divide, surface waters flow via the South Platte River, the North Platte River, the Republican River, the Arkansas River, the Cimarron River, the Canadian River, or the Rio Grande to the Gulf of Mexico.  West of the Continental Divide, surface waters flow via the Green River, the upper Colorado River (formerly the Grand River), or the San Juan River into the Colorado River and on to the Gulf of California.  Colorado also has three significant endorheic basins: the San Luis Closed Basin in the San Luis Valley, and the Bear Creek Basin and the White Woman Basin spanning the Colorado-Kansas border north and south of the Arkansas River. South-Central Colorado is a region of the U.S. state of Colorado.  It can be roughly defined by Chaffee County in the northwest, El Paso County in the northeast, Las Animas County in the southeast, and Conejos County in the southwest.  Some notable towns and cities there include Colorado Springs, Pueblo, Cripple Creek, Cañon City, Salida, Buena Vista, Monte Vista, Alamosa, Walsenburg, and Trinidad.  The landscapes of South-Central Colorado were made known to the Western world by the explorations of Zebulon Pike and Kit Carson, who were later followed by settlers, many of whom came by the Santa Fe Trail.  The upper tributaries of the Arkansas River and South Platte River provide ample whitewater rafting and are famous for trout and bass fishing in scenic settings such as Royal Gorge.  Much of the local economic system is dependent on mining, forestry, ranching, and tourism related to these endeavors.  South-Central Colorado has so far largely escaped urbanization, allowing visitors to experience something of the American Old West. The San Juan River is a major tributary of the Colorado River in the southwestern United States, providing the chief drainage for the Four Corners region of Colorado, New Mexico, Utah and Arizona.  Originating as snowmelt in the San Juan Mountains (part of the Rocky Mountains) of Colorado, it flows 383 mi through the deserts of northern New Mexico and southeastern Utah to join the Colorado River at Glen Canyon.  The river drains a high, arid region of the Colorado Plateau and along its length it is often the only significant source of fresh water for many miles.  The San Juan is also one of the muddiest rivers in North America, carrying an average of 25 million US tons (22.6 million t) of silt and sediment each year. The Uinta Basin (sometimes spelled Uintah Basin), is a physiographic section of the larger Colorado Plateaus province, which in turn is part of the larger Intermontane Plateaus physiographic division.  It is also a geologic structural basin in eastern Utah, east of the Wasatch Mountains and south of the Uinta Mountains.  The Uinta Basin is fed by creeks and rivers flowing south from the Uinta Mountains.  Many of the principal rivers (Strawberry River, Currant Creek, Rock Creek, Lake Fork River, and Uinta River) flow into the Duchesne River which feeds the Green River—a tributary of the Colorado River.  The Uinta Mountains forms the northern border of the Uinta Basin.  They contain the highest point in Utah, Kings Peak, with a summit 13,528 feet (4123 metres) above sea level. The Colorado River is one of the principal rivers of the Southwestern United States and northern Mexico (the other being the Rio Grande).  The 1450 mi river drains an expansive, arid watershed that encompasses parts of seven U.S. and two Mexican states.  Starting in the central Rocky Mountains in the U.S., the river flows generally southwest across the Colorado Plateau and through the Grand Canyon before reaching Lake Mead on the Arizona–Nevada border, where it turns south toward the international border.  After entering Mexico, the Colorado approaches the mostly dry Colorado River Delta at the tip of the Gulf of California between Baja California and Sonora. Terlingua Creek is a stream in the U.S. state of Texas.  It is a tributary of the Rio Grande. Walnut Creek is a 23 mi long tributary stream of the Colorado River in Texas.  It flows from north to south, crossing the Edwards Plateau on the western side of Austin, down to the Blackland Prairie on the eastern side of the city where it then drains into the Colorado River downstream of Longhorn Dam.  The stream's upper region flows over limestone, while the southern stretch passes through deeper clay soils and hardwood forest.  Walnut Creek's watershed, spanning 36000 acre , is the largest in Central Austin.
Answer: Rio Grande