What area did Bartholomeu dias explored or discovered?

In 1488, Portuguese explorer Bartolomeu Dias (c. 1450-1500) became the first European mariner to round the southern tip of Africa, opening the way for a sea route from Europe to Asia. So basically he discovered the tip of Africa while looking for a trade route to India.

Bartolomeu Dias, also called Bartholomew Diaz, was a Portuguese navigator whose discovery in 1488 of the Cape of Good Hope showed Europeans there was a feasible route to India around the storm-driven southern tip of Africa