paragraph_text: The Mississippi River is the chief river of the second - largest drainage system on the North American continent, second only to the Hudson Bay drainage system. Flowing entirely in the United States (although its drainage basin reaches into Canada), it rises in northern Minnesota and meanders slowly southwards for 2,320 miles (3,730 km) to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains all or parts of 31 U.S. states and 2 Canadian provinces between the Rocky and Appalachian Mountains. The Mississippi ranks as the fourth - longest and fifteenth - largest river in the world by discharge. The river either borders or passes through the states of Minnesota, Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana.

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 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: 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 Vésubie is a river in the southeast of France. It is a left tributary of the Var River in the Maritime Alps. The source is in the Mercantour National park near the border with Italy. The river flows through the town of Saint-Martin-Vésubie which is a major center for hiking. It flows into the Var near Levens. One of its tributaries is the Gordolasque.

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: The Arghistan or Arghastan is a river in southern Afghanistan. It flows through Arghistan District and the provinces of Zabul and Kandahar. It is a tributary of the Dori River, a sub-tributary of the Helmand River. It flows for and has a basin area of .

paragraph_text: Kilmez River (; ) is a river in Udmurtia and Kirov Oblast in Russia, a left tributary of the Vyatka River. The river is long, and the area of its drainage basin is . The Kilmez freezes up in November and remains icebound until the second half of April. Its main tributaries are the Lumpun, Loban, and Vala rivers.

paragraph_text: The Nanya River is the primary right tributary of the middle Dadu River (Dadu He) — in Sichuan Province, southern China. The Dadu is a tributary of the upper Yangtze River (Chang Jiang).

paragraph_text: The Big Darby Creek State Scenic River is a river located in northwestern central Ohio, and an important tributary to the Lower Scioto River. The river's major tributary is the Little Darby Creek.

paragraph_text: The Putumayo River or Içá River (, ) is one of the tributaries of the Amazon River, west of and parallel to the Japurá River.

paragraph_text: The purple martin migrates to the Amazon basin in winter. Its winter range extends into Ecuador but does not seem to ascend far up the Andean foothills.

paragraph_text: Balagas River is a river of northern Ethiopia. A tributary of the Tekezé, its own tributaries include the Balessa and Dorana rivers.

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 Raush River is a tributary of the Fraser River in British Columbia, Canada. It drains a watershed of approximately on the eastern flanks of the Cariboo Mountains, a sub-range of the Columbia Mountains. The river joins the Fraser near the community of Dunster in the Robson Valley. The river's name is the result of a transcription error; it was originally called the "Rivière au Shuswap", this was recorded on some maps as "R.auSh.", which then became "Raush" on official maps. Its source is the Raush Glacier, and major tributary creeks include Black Martin and Quanstrom.

paragraph_text: The Chilako River is a tributary of the Nechako River, one of the main tributaries of the Fraser River, in the Canadian province of British Columbia. It flows through the Nechako Plateau.

paragraph_text: Deans Brook is a two-kilometre-long stream which runs between Mill Hill and Edgware in the London Borough of Barnet. It is a tributary of the Silk Stream, which is a tributary of the River Brent, which is a tributary of the River Thames.

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 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.

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.

Question: When do purple martins migrate to the continent where the river Tebicuary River is a tributary of located?
Answer: winter