Which one of the following lakes forms an international boundary between Tanzania and Uganda ?

Correct answer: 3 (Victoria). Lake Victoria forms part of the international boundary between Tanzania and Uganda. Entebbe, a major lakeside town, lies on Lake Victoria, confirming the lake’s direct association with Uganda [1]. Lake Victoria is also the world’s second-largest freshwater lake by surface area, reflecting its large size and transboundary nature in East Africa [2]. Its extensive shoreline spans multiple countries, and along portions of its coast it separates Uganda and Tanzania, creating a natural international frontier. The other choices (Lake Chad, Lake Malawi, and the Zambezi) do not delineate the Tanzania–Uganda border, so Lake Victoria is the correct option.

Sources

1. [1] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 31: Settlements and Towns > Location of settlements > p. 315
2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 9: Divergent Boundary > Rift Valley Lakes > p. 128