paragraph_text: The Boone River is a tributary of the Des Moines River in north-central Iowa in the United States. It is long and drains an area of . Via the Des Moines River, it is part of the watershed of the Mississippi River.

paragraph_text: The Gryžuva is a short river in the western part of Lithuania, a tributary of the Dubysa. It begins 5 km north of Tytuvėnai city and flows mostly to the southwest. Its average width is about 6 m. Its only tributary is the Apušis river.

paragraph_text: The Wanaque River (Native American for "place of the sassafras") is a tributary of the Pequannock River in Passaic County in northern New Jersey in the United States.

paragraph_text: The Bargo River rises in the southern slopes of Southern Highlands, north of Colo Vale, and flows generally north-east, joined by two minor tributaries, before reaching its confluence with the Nepean River, near Bargo.

paragraph_text: The Turtle River is a tributary of the Red River of the North in northeastern North Dakota in the United States. It flows for almost its entire length in Grand Forks County. Via the Red River, Lake Winnipeg and the Nelson River, the Turtle River is part of the watershed of Hudson Bay.

paragraph_text: The Waimamakau River is a short river of the Northland Region of New Zealand's North Island. Confusingly, it is a tributary of the Waimamaku River, reaching the latter 10 kilometres southeast of Omapere.

paragraph_text: The Sandy River and its tributary the Little Sandy River are short rivers in north-central South Carolina in the United States. The Sandy is a tributary of the Broad River; via the Broad and Congaree Rivers, it is part of the watershed of the Santee River, which flows to the Atlantic Ocean.

paragraph_text: The Prairie River is a tributary of the Wisconsin River in north-central Wisconsin in the United States. It is about 40 mi (65 km) long. Via the Wisconsin River, it is part of the Mississippi River watershed.

paragraph_text: The Tebicuary River (Spanish: Río Tebicuary), a tributary of Paraguay River is a river in Paraguay. Located in the southwestern part of that country, it flows eastwards discharging to Paraguay River about 45 km south of Formosa and 30 km north of Pilar.

paragraph_text: Kwe Kwe River is a small river that runs by the town of Kwekwe in Zimbabwe. It is a lesser tributary of the Sebakwe River and it joins the Sebakwe River north of the town. The water from the river is used by the steel industry that forms the backbone of the town of Kwekwe. The Sebakwe River is a tributary of the mighty Zambezi River.

paragraph_text: The Knife River is a tributary of the Missouri River, approximately 120 mi (193 km) long, in North Dakota in the United States.

paragraph_text: The Impey River is a river in the Mid West of Western Australia which rises south of Mount Murchison and flows east-north-east until it merges with the Murchison River of which it is a tributary.

paragraph_text: Bamboes Spruit, (or Bamboesspruit) is a river in the North West Province of South Africa. It is a tributary of the large Vaal River, emptying into the Bloemhof Dam.

paragraph_text: The River Yeo, also known as the River Ivel, is a tributary of the River Parrett in north Dorset and south Somerset, England.

paragraph_text: The North Concho River is a river in west-central Texas and one of three tributaries of the Concho River. The river is long. The other two tributaries are the Middle Concho and South Concho Rivers. The Concho River flows into the Colorado River (in Texas, not to be confused with the Colorado that flows through Arizona and Nevada).

paragraph_text: Mississagi Provincial Park is a natural environment-class park north of Elliot Lake, in Algoma District, Ontario, Canada. It lies on the Boland River, a tributary of the Little White River, which is a tributary of the Mississagi River. The park is accessed via Highway 639.

paragraph_text: The Paraguay River (Río Paraguay in Spanish, Rio Paraguai in Portuguese, Ysyry Paraguái in Guarani) is a major river in south-central South America, running through Brazil, Bolivia, Paraguay and Argentina. It flows about from its headwaters in the Brazilian state of Mato Grosso to its confluence with the Paraná River north of Corrientes and Resistencia.

paragraph_text: The Kitwanga River is a tributary of the Skeena River near Hazelton in northwestern British Columbia, Canada, joining that stream at the community of Kitwanga (Gitwangak), which means "people of the place of rabbits".

paragraph_text: The North Branch of the Contoocook River is a river located in southwestern New Hampshire in the United States. It is a tributary of the Contoocook River, part of the Merrimack River watershed.

paragraph_text: A significant body of water (referred to as the Central American Seaway) once separated the continents of North and South America, allowing the waters of the Pacific and Atlantic Oceans to mix freely. Beneath the surface, two plates of the Earth's crust were slowly colliding, forcing the Cocos Plate to slide under the Caribbean Plate. The pressure and heat caused by this collision led to the formation of underwater volcanoes, some of which grew large enough to form islands as early as 15 million years ago. Meanwhile, movement of the two tectonic plates was also pushing up the sea floor, eventually forcing some areas above sea level.

Question: When did the collision take place between North America and the continent the river of which Tebicuary River is a tributary can be found?
Answer: as early as 15 million years ago