South Africa – Flag in Lexicon and Shop https://www.flaggenlexikon.de/fsuedafr_me.htm
South Africa is a country in southern Africa. The flag shows a lying, green Ypsilon with a black field on the mast, separated by a gold stripe; An upper red and a lower blue field are separated from the Ypsilon with narrow white stripes.
Transvaal flag was the Dutch flag with a vertical green bar