paragraph_text: The Usno River is a tributary of the Omo River in Ethiopia. Formed by the confluence of the Magi and the Neri rivers, it flows south past the Nyalibong Hills before entering the Omo at . Almost all of the Usno's course is inside the boundaries of the Mago National Park.

paragraph_text: Zamantı River is a river in Central Anatolia, Turkey, crossing Kayseri Province in practically its whole course to join Seyhan River further south, of which it is the western, the longest and the most important tributary. Zamantı and Göksu join 80 km north of Adana to form Seyhan River.

paragraph_text: The Lubefu River is a tributary of the Sankuru River, which in turn is a tributary of the Kasai River in the Democratic Republic of the Congo.

paragraph_text: The Changane River () is a river in Mozambique, a tributary to the Limpopo River which it joins near the coast, just past the town of Chibuto. It forms part of the eastern boundary of Gaza Province. The Changane is the easternmost tributary of the Limpopo, entering it from the left near its mouth on the Indian Ocean

paragraph_text: The Rivière aux Mélèzes (also known as the Larch River and in Inuktitut as Kuuvik) is a river in Nunavik, Quebec, Canada. It forms the western part of the large basin of the Koksoak River. The other main tributary of the Koksoak is the Caniapiscau River, to the south.

paragraph_text: The Narym River (, "Naryn") is a river in Eastern Kazakhstan, a tributary of the Irtysh River, originating at the junction of the ridges Narym and Sarymsakty of wetland formed by the mountain runoff streams. With its low headwaters and smooth clay-sandy bed, the width of the river valley at places extends to more than ; in some places it narrows to . The width of the river is , and the depth varies from .

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: The Jemez River is a tributary of the Rio Grande in the U.S. state of New Mexico. The river is formed by the confluence of the East Fork Jemez River and San Antonio Creek, which drain a number of tributaries in the area of the Jemez Mountains and Santa Fe National Forest. The Jemez River is about long, or about long if its longest headwater tributary, San Antonio Creek, is included. The East Fork Jemez River is about long. Both San Antonio Creek and the East Fork Jemez River flow through intricate meanders along their courses. The East Fork Jemez is a National Wild and Scenic River.

paragraph_text: The Mongala River in northern Democratic Republic of the Congo is a tributary of the Congo River. The Ebola River forms the headstream of the Mongala River.

paragraph_text: The Uzh () is a river, a right tributary of the Pripyat, which empties into the Kiev Reservoir, in central Ukraine. It takes its source in the Zhytomyr Oblast (province) of northern Ukraine, and then flows briefly near the delta of the Berezina River. The Uzh then flows near the city of Chernobyl of Kiev Oblast, into the Pripyat River.

paragraph_text: The Kuta River is a Siberian river north of Lake Baikal in Irkutsk Oblast, Russia, that flows into the Lena River at Ust-Kut. With its right tributary, the Kupa River, it forms a ‘T’ shape with the flat head pointing west and the point at Ust-Kut.

paragraph_text: The Waimea River is a tributary of the Mataura River in Southland, New Zealand. The Waimea Plains around this river form part of the Southland Plains.

paragraph_text: Tatarka River () is a river in Perm Krai, Russia, a right bank tributary of the Babka River, which in turn is a tributary of the Sylva River. The river is long.

paragraph_text: In the last million years since the Late Miocene, South America became connected with the continent of North America via the Panama Block that closed the marine Bolivar Trough, leading to the Great American Interchange, the interchange of biota from both continents. The first species discovered to have made the northward migration was Pliometanastes, a fossil ground sloth species, roughly the size of a modern black bear. Several migrations to the Southern Hemisphere were undertaken by tougher, North American mammal carnivores; fewer species migrated in the opposite direction from south to north. The result of the intrusion of North American fauna was that hundreds of South American species became extinct in a relatively short time and that about 60% of present - day South American mammals have evolved from North American species. However, some species were able to adapt and spread into North America. Apart from Pliometanastes, during the Irvingtonian stage of the mammal land stages, around 1.9 Ma, species as Pampatherium, a giant armadillo, ground sloth Megatherium, giant anteater Myrmecophaga, a Neogene capybara (Hydrochoerus), Meizonyx, opossum Didelphis, and Mixotoxodon followed the route north. The terror bird Titanis was the only discovered South American carnivore species who made the journey into North America.

paragraph_text: The Marias River is a tributary of the Missouri River, approximately 210 mi (338 km) long, in the U.S. state of Montana. It is formed in Glacier County, in northwestern Montana, by the confluence of the Cut Bank Creek and the Two Medicine River. It flows east, through Lake Elwell, formed by the Tiber Dam, then southeast, receiving the Teton River at Loma, 2 mi. (3.2 km) above its confluence with the Missouri.

paragraph_text: The Ardila () is a river of Spain and Portugal and a tributary of the Guadiana. Its length is . A portion of the river forms the Portugal–Spain border.

paragraph_text: Sara River rises on the southern slopes of Mount Mitchell on the western slopes of the Great Dividing Range, east of Ben Lomond, and flows generally to the east, joined by three tributaries, including Oban River, before forming its confluence with the Guy Fawkes River to form the Boyd River within Guy Fawkes River National Park and Chaelundi National Park. Sara River descends over its course.

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 Des Plaines River () is a river that flows southward for through southern Wisconsin and northern Illinois in the United States Midwest, eventually meeting the Kankakee River west of Channahon to form the Illinois River, a tributary of the Mississippi River.

paragraph_text: The Paute River is a river of Ecuador. It is a tributary of the Santiago River, which is a tributary of the Amazon River. The Paute Dam is located on the river.

Question: When did the continent home to the river of which Tebicuary River is a tributary take the form it has today?
Answer: In the last million years since the Late Miocene