It is to study Africa in the Kangnido by comparing it with the other world maps in Afro-Eurasia. It examines the circumnavigability of Africa in Herodotus`` Histories, Ptolemy``s reconstructed world map, al-Biruni``s geographical writings, Niccolo de Conti``s travels, and Gavin Menzies`` 1421. And it argues that the big lake in Africa in the Kangnido seems to be related the trade of gold held by Islamic traders. Al-Idrisi and Islamic geographers paid attention to "Wangara" in his world map because Wangara is the Niger delta where gold trade took place. This paper argues that "桑骨八" inscribed in the left side of the lake in Kangnido refers to the black people``s region rather than Zanzibar. It also says that the mountains of the moon can refer to different places although it looks similar in various world maps in that the mountains of the moon depicts the origins of the Nile. The Nile in the Kangnido goes to the Red Sea rather than the Mediterranean Sea. The course of the Nile refers to Wadi Hammamat rather than the Canal of the Pharaohs, since the canal was closed in mid-eighth century but Wadi Hammamat was prosperous even in the fourteenth century.