Which one of the following is not correctly matched?

The incorrect pair is A. The world's tallest waterfall is Angel Falls in Venezuela (about 979 m, on the Churun river in Bolívar state). Tugela Falls in the Drakensberg, South Africa, is the second tallest, at about 948 m. The question is about matching the top rank, so Tugela cannot be the answer for tallest.

• B is correct: Lake Superior is the largest freshwater lake by surface area.
• C is correct: Lake Titicaca, on the Peru-Bolivia border at about 3,812 m, is the highest navigable lake.
• D is correct: Lake Tanganyika is the second deepest lake after Lake Baikal, reaching about 1,470 m.

The concept here is the set of world records for lakes and waterfalls, which appears regularly in Geography prelims. For Mains, these features link to the Drakensberg and Andean hydro-resources and to lake-basin ecology.

Trap: Aspirants who remember Tugela as a famous tall waterfall pick it for the top rank. Always check whether the question asks for first or second position.