What are the three smallest countries in Africa?

This list is of sovereign states - and does not include protectorates

Islands:

The Seychelles (Island) 451 km2

Sao Tome and Principe (Island) 964 km2

Mauritius (Island) 2040 km2

Mainland:

Gambia - 10,380 km2

Swaziland - 17,364 km2

Djibouti - 23,200 km2