Question: When was the southern tip of the continent that contains the river that the Tekezé turns into, colonized?

<P0-S0> Britain formally acquired the colony, and its large Afrikaner (or Boer) population in 1806, having occupied it in 1795 to prevent its falling into French hands, following the invasion of the Netherlands by France. <P0-S1> The Dutch East India Company had founded the Cape Colony on the southern tip of Africa in 1652 as a way station for its ships travelling to and from its colonies in the East Indies. <P0-S2> British immigration began to rise after 1820, and pushed thousands of Boers, resentful of British rule, northwards to found their own—mostly short-lived—independent republics, during the Great Trek of the late 1830s and early 1840s. <P0-S3> In the process the Voortrekkers clashed repeatedly with the British, who had their own agenda with regard to colonial expansion in South Africa and with several African polities, including those of the Sotho and the Zulu nations. <P0-S4> Eventually the Boers established two republics which had a longer lifespan: the South African Republic or Transvaal Republic (1852–77; 1881–1902) and the Orange Free State (1854–1902). <P0-S5> In 1902 Britain occupied both republics, concluding a treaty with the two Boer Republics following the Second Boer War (1899–1902). <SEP> <P1-S0> It flows about 805 km (500 mi) to the Nile in north-central Sudan, joining it at the city of Atbarah (). <P1-S1> The river's tributary, the Tekezé (Setit) River, is perhaps the true upper course of the Atbarah, as the Tekezé follows the longer course prior to the confluence of the two rivers (at 14° 10' N, 36° E) in northeastern Sudan. <P1-S2> The Atbarah is the last tributary of the Nile before it reaches the Mediterranean. <P1-S3> The Atbarah River (; transliterated: Nahr 'Atbarah) in northeast Africa rises in northwest Ethiopia, approximately 50 km north of Lake Tana and 30 km west of Gondar. <SEP> <P2-S0> the crati is a river in calabria, southern italy. <P2-S1> it is the largest river of calabria and the third largest river of southern italy after the volturno and the sele. <P2-S2> in classical antiquity it was known as the crathis or crater (greek: ). <SEP> <P3-S0> the cuyuni river is a south american river and a tributary of the essequibo river. <P3-S1> it rises in the guiana highlands of venezuela where it descends northward to el dorado, and turns eastward to meander through the tropical rain forests of guyana. <P3-S2> it finally turns southeastward, flowing to its confluence with the mazaruni river. <P3-S3> the cuyuni river marks the limit of the disputed territory of guayana esequiba for approximately . <SEP> <P4-S0> The Tekezé River rises in the central Ethiopian Highlands near Mount Qachen within Lasta, from where it flows west, north, then west again, forming the westernmost border of Ethiopia and Eritrea from the confluence of the Tomsa with the Tekezé at to the tripoint between the two countries and Sudan at . <P4-S1> The Tekezé is perhaps the true upper course of the Atbarah, as the former follows the longer course prior to the confluence of the two rivers. <P4-S2> After entering northeastern Sudan at the tripoint it joins the Atbarah River, which is a tributary of the Nile.