Early reports of Europeans reaching this area include those of the Venetian Alvise Cadamosto's voyage of 1455, the 1479–1480 voyage by Flemish-French trader Eustache de la Fosse, and Diogo Cão. In the 1480s this Portuguese explorer reached the Congo River and the lands of Bakongo, setting up the foundations of modern <answer>Angola</answer>, some 4200 km down the African coast from Guinea-Bissau.
What country is about 4200 km from Guinea-Bissau?
Angola