Question: What is the source of the river of which Kraai River is a tributary?

Context paragraphs:
paragraph_text: The Klehini River is about long from its source in British Columbia to its mouth at the Chilkat River, of which it is the largest tributary. The Klehini River is renowned for its salmon runs, its biannual congregation of bald eagles—the second largest in the Haines area after the Chilkat River's Council Grounds—and for the Klehini Falls. The Klehini also delineates the northern boundary of the Chilkat Range.
title: Klehini River
paragraph_text: The Raba is a river in the south of Poland (Lesser Poland Voivodeship), right tributary to the river Vistula. Its source is in the Beskids, between the towns of Rabka-Zdrój and Nowy Targ. It flows to the north and then to the northeast. Towns along the river Raba include Rabka-Zdrój, Mszana Dolna, Myślenice, Dobczyce and Bochnia.
title: Raba (river)
paragraph_text: Bolshaya Lyampa () is a river in Perm Krai, Russia, a right tributary of Uls River which in turn is a tributary of Vishera River. The river is long. Its source is near the border with Sverdlovsk Oblast. It flows into the Uls River from the larger river's mouth. The Bolshaya Lyampa's main tributary is the Malaya Lyampa River.
title: Bolshaya Lyampa
paragraph_text: The Kraai River originates in the mountains south of Lesotho and flows westward from the confluence of the Bell River and the Sterkspruit at Moshesh's Ford at all the way to Aliwal North, where it joins the Orange River at .
title: Kraai River
paragraph_text: The Thoré () is a long river in the Hérault and Tarn "départements", southwestern France. Its source is in the northern part of Rieussec. It flows generally northwest. It is a left tributary of the Agout into which it flows between Navès and Castres.
title: Thoré
paragraph_text: The sources of the Congo are in the highlands and mountains of the East African Rift, as well as Lake Tanganyika and Lake Mweru, which feed the Lualaba River, which then becomes the Congo below Boyoma Falls. The Chambeshi River in Zambia is generally taken as the source of the Congo in line with the accepted practice worldwide of using the longest tributary, as with the Nile River.
title: Congo River
paragraph_text: Orange Gariep, Oranje, Senqu River Sunset over the Orange River near Upington in the Northern Cape Countries Lesotho, South Africa, Namibia Tributaries - right Caledon River, Vaal River, Fish River (Namibia) Landmarks Gariep Dam, Augrabies Falls Source Thaba Putsoa - location Maloti Mountains (Drakensberg), Lesotho - elevation 3,350 m (10,991 ft) Mouth Alexander Bay - location Atlantic Ocean Length 2,200 km (1,367 mi) Basin 973,000 km (375,677 sq mi) Discharge - average 365 m / s (12,890 cu ft / s) The course and watershed of the Orange River, Caledon River and Vaal River. This map shows a conservative border for the watershed. Specifically, the Kalahari basin is excluded, as some sources say it is endorheic. Some other sources using computational methods show a basin which includes parts of Botswana (and hence of the Kalahari).
title: Orange River
paragraph_text: The Kabompo River is one of the main tributaries of the upper Zambezi River. It flows entirely in Zambia, rising to the east of the source of the Zambezi, in North-Western Province along the watershed between the Zambezi and Congo river basins which also forms the border between Zambia and DR Congo.
title: Kabompo River
paragraph_text: The Neste is a river in southern France, a left tributary of the Garonne. It rises from several sources around Saint-Lary-Soulan, central Pyrenees and flows through
title: Neste (river)
paragraph_text: The Shaksgam River (, , ) is a left tributary of the Yarkand River. The river is also known as the Kelechin River and Muztagh River. It rises in the Gasherbrum, Urdok, Staghar, Singhi and Kyagar Glaciers in the Karakoram. It then flows in a general northwestern direction parallel to the Karakoram ridge line in the Shaksgam Valley. The river valley was explored in 1889 by Francis Younghusband (who referred to the Shaksgam as the Oprang)., and again in 1926 by Kenneth Mason, who confirmed the sources of the river.
title: Shaksgam River
paragraph_text: Mangalam River is the main tributary of the river Gayathripuzha, which in turn is a tributary of Bharathapuzha, the second longest river in Kerala, India. It is around 30 km long in length, with its source from Nelliyampathi forests, and passing through Vadakkencherry, Kannambra, Puthucode, Padur, etc. and joining Gayathripuzha at Plazhi in the border of Thrissur and Palakkad districts.
title: Mangalam River
paragraph_text: The Chapare River is a river in Bolivia, which is a tributary of the Mamoré River in the Amazon Basin. The river has its source at the confluence of Espíritu Santo River and San Mateo River in the Cochabamba Department at Villa Tunari. It is the main waterway of Chapare Province. The fish Gephyrocharax chaparae is found in and named after the Chapare River.
title: Chapare River
paragraph_text: Bhilangna River is a Himalayan river in Uttarakhand, India, which is the major tributary of the Bhagirathi river, the source stream of the Ganges River of India.
title: Bhilangna River
paragraph_text: The Rufiji River lies entirely within Tanzania. The river is formed by the confluence of the Kilombero and Luwegu rivers. It is approximately 600 kilometres (370 mi) long, with its source in southwestern Tanzania and its mouth on the Indian Ocean at a point between Mafia Island called Mafia Channel. Its principal tributary is the Great Ruaha River. It is navigable for about 100 kilometres (62 mi).
title: Rufiji River
paragraph_text: The Cagne is a river that flows through the Alpes-Maritimes department of southeastern France. Its source is near Coursegoules, and it flows into the Mediterranean Sea in Cagnes-sur-Mer. The Malvan is one of its tributaries.
title: Cagne
paragraph_text: The source of the Nile is sometimes considered to be Lake Victoria, but the lake has feeder rivers of considerable size. The Kagera River, which flows into Lake Victoria near the Tanzanian town of Bukoba, is the longest feeder, although sources do not agree on which is the longest tributary of the Kagera and hence the most distant source of the Nile itself. It is either the Ruvyironza, which emerges in Bururi Province, Burundi, or the Nyabarongo, which flows from Nyungwe Forest in Rwanda. The two feeder rivers meet near Rusumo Falls on the Rwanda - Tanzania border.
title: Nile
paragraph_text: The river Loimijoki is a river in Finland and the longest tributary of the river Kokemäenjoki. The river originates at the lake Pyhäjärvi in Tammela and joins the river Kokemäenjoki in Huittinen. There is a difference in elevation between the source and the mouth of the river, which is long. The river drains a catchment area of . The river has several dams at Forssa, Jokioinen and Loimaa.
title: Loimijoki
paragraph_text: The Hushe River is a tributary river to the Shyok River which itself is tributary to the Indus River. The main source of the Hushe River is the Gondogoro Glacier. Some streams also flow from other glaciers of the Hushe valley. The Hushe river joins with Saltoro River at Haldi village before joining the Shyok River. Both the Hushe and Saltoro rivers join the Shyok river at the Tsa thang Ghursa village.
title: Hushe River
paragraph_text: Utva () is a river in Perm Krai, Russia, a right tributary of the Veslyana River, which in turn is a tributary of the Kama River. The river is long, and its drainage basin covers . The source of the river is in the extreme southwest of the Gaynsky District of Perm Krai, near the border with Kirov Oblast and the Komi Republic. The main tributaries are the Chugrum River (right) and the Yuzhnaya Anva River (left).
title: Utva River (Perm Krai)
paragraph_text: The Rhonelle is a river of northern France. It is a right tributary of the Scheldt. Its source is near Locquignol. It flows generally northwest along Le Quesnoy, Villers-Pol and Famars. It flows into the Scheldt in Valenciennes.
title: Rhonelle

Reasoning steps:
What is Kraai River a tributary of? >>>> Orange River
what is the source of Orange River >>>> Thaba Putsoa

Answer: spans: Thaba Putsoa