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?

full_context: Document 1: Rainwater Creek: Rainwater Creek is a 3.9 mi tributary stream of Lake Fork Creek. It flows into Lake Fork Creek downstream from the Lake Fork Reservoir Dam approximately four miles west of Quitman in western Wood County, Texas. Its primary source is a spring, augmented by stormwater runoff. It is named for the family of William Walton Rainwater, who was among the earliest permanent settlers of the area.
Document 2: Colorado River (Texas): The Colorado River is an 862 mi long river in the U.S. state of Texas. It is the 18th longest river in the United States and the longest river with both its source and its mouth within Texas.
Document 3: Colorado drainage basins: 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.
Document 4: Terlingua Creek: Terlingua Creek is a stream in the U.S. state of Texas. It is a tributary of the Rio Grande.
Document 5: Walnut Creek (Central Texas): 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.
Document 6: Cottonwood Creek (Guadalupe County): Cottonwood Creek is a stream in South Central Texas, United States that runs approximately 9 miles from its source five miles east of New Berlin, Texas (in the Texas Prairielands), to its confluence with the Guadalupe River in Guadalupe County, Texas, four miles southeast of Seguin. The creek serves as a tributary of the Guadalupe River and forms its watershed near Seguin, Texas. There is a separate Cottonwood Creek that flows through northern Guadalupe County before discharging into the San Marcos River above Kingsbury.
Document 7: Tiber Creek: Tiber Creek or Tyber Creek is a tributary of the Potomac River in Washington, D.C. In the 19th century it was modified to become part of the Washington City Canal, and subsequently was enclosed in a tunnel.
Document 8: San Antonio River: The San Antonio River is a major waterway that originates in central Texas in a cluster of springs in Midtown San Antonio, approximately four miles north of Downtown, and follows a roughly southeastern path through the state. It eventually feeds into the Guadalupe River about ten miles from San Antonio Bay on the Gulf of Mexico. The river is 240 miles long and crosses five counties: Bexar, Goliad, Karnes, Refugio, and Wilson.
Document 9: Rio Grande: 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.
Document 10: United States Boundary Commissioner: Article V of the TREATY OF PEACE, FRIENDSHIP, LIMITS, AND SETTLEMENT BETWEEN THE UNITED STATES OF AMERICA AND THE UNITED MEXICAN STATES CONCLUDED AT GUADALUPE HIDALGO (known commonly as the Treaty of Guadalupe Hidalgo ) declared that the new boundary between the two republics of the United States and Mexico would lay "three leagues from land, opposite the mouth of the Rio Grande, otherwise called Rio Bravo del Norte, or Opposite the mouth of its deepest branch, if it should have more than one branch emptying directly into the sea; from thence up the middle of that river, following the deepest channel, where it has more than one, to the point where it strikes the southern boundary of New Mexico; thence, westwardly, along the whole southern boundary of New Mexico (which runs north of the town called Paso) to its western termination; thence, northward, along the western line of New Mexico, until it intersects the first branch of the river Gila; (or if it should not intersect any branch of that river, then to the point on the said line nearest to such branch, and thence in a direct line to the same); thence down the middle of the said branch and of the said river, until it empties into the Rio Colorado; thence across the Rio Colorado, following the division line between Upper and Lower California, to the Pacific Ocean. " It delineated the boundary through its text but wasn't written with much knowledge of the area's actually geography; A commissioner and surveyor from each country were appointed to precisely locate landmarks and accurately map the new border, relying on the treaty as their guide.
Document 11: San Ildefonso Creek: San Idelfonso Creek is a small stream of water located in Webb County, Texas which runs through Laredo, Texas. The creek is formed within east Laredo and runs southwest for 8 miles until connecting to the Rio Grande. San Ildefonso Creek was dammed in east Laredo to form San Ildefonso Creek Lake, the second largest Lake in Laredo. The terrain surrounding the creek is mostly clay and sandy loams. The vegetation surrounding the creek is mostly made up of mesquite, cacti, chaparral, hardwoods and grasses. San Idelfonso Creek crosses two major highways in Laredo, Texas among them are: Texas State Highway 359 and United States Route 83
Document 12: Granite Creek (Arizona): Granite Creek is a 38 mi tributary of the Verde River in the U.S. state of Arizona. It flows generally north-northeast from the Bradshaw Mountains of west-central Arizona through the city of Prescott and the Granite Dells to meet the river at the north end of the Little Chino Valley east of Sullivan Lake.
Document 13: Onion Creek (Texas): 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
Document 14: Colorado River: 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.
Document 15: Laredo, Texas: Laredo ( ; ] ) is the county seat of Webb County, Texas, United States, located on the north bank of the Rio Grande in South Texas, across from Nuevo Laredo, Tamaulipas, Mexico. According to the 2010 census, the city population was 236,091, making it the tenth-most populous city in the state of Texas and third-most populated on the Mexico–United States border, after San Diego, California, and El Paso, Texas. Its metropolitan area is the 178th-largest in the
ground_truth: Rio Grande