Which nations controlled the largest portion of africa?

Britain and France controlled the largest portion of the continent of Africa.

Explanation:

The Congo Conference of 1884 that happened in Germany resulted in the division of the continent of Africa in order to settle the dispute between Britain and France and for the convenience of governance by the two parties. The conference concluded in letting Britain have their control over most part of the continent followed by France. It was completely based on the then military might and the prowess of the two countries in the European collaboration.

The geographic feature in the westernmost corner of kenya is answer: the great rift vally