"Tanzania flag was the result of the unification of the Republic of Zanzibar People’s Republic and the Republic of Tanganyika as a state. Starting from the lower left corner of the flag, a thick black stripe extending to the upper right section divides the flag into two and forms a triangle on both sides. The triangle in the upper left part of the flag is green and the triangle in the lower right is shown in blue. The black thick strip is separated from blue and green colors by a thin yellow strip.
Blue, green and black in the flag are common colors of both countries, and the yellow color is also used to symbolize gold because the new country is rich in underground mines. While the green color expresses the country’s fertile lands, the blue color represents the Indian Ocean, the coast of the country. The black color in the middle represents the African people." (source: mappr)