<Li> Tanzania: <Ul> <Li> Tanganyika Territory (1919--61) </Li> <Li> Zanzibar </Li> </Ul> </Li> <Ul> <Li> Tanganyika Territory (1919--61) </Li> <Li> Zanzibar </Li> </Ul> <Li> Tanganyika Territory (1919--61) </Li> <Ul> <Li> British Mauritius </Li> <Li> Bechuanaland (now Botswana) </Li> <Li> Southern Rhodesia (now Zimbabwe) </Li> <Li> Northern Rhodesia (now Zambia) </Li> <Li> British Seychelles </Li> <Li> British South Africa <Ul> <Li> South Africa: <Ul> <Li> Transvaal Colony </Li> <Li> Cape Colony </Li> <Li> Colony of Natal </Li> <Li> Orange River Colony </Li> </Ul> </Li> <Li> South - West Africa (from 1915, now Namibia) </Li> </Ul> </Li> </Ul>

Which european country has the most valuable colonies