Africa

Africa appears as a strategic stretch of coastline in the maritime system linking Europe with Asia. Its importance lies less in a depicted land journey than in the forts, provisions, and sea routes that shape who can cross the oceans and on what terms.

The Portuguese Route

John Blackthorne explains that Portuguese ships favor the route around the Cape of Good Hope because Portugal has forts along the coasts of Africa, India, and the Spice Islands. These stations allow ships to provision and overwinter, while Portuguese galleon-warships patrol and monopolize the sea lanes. Africa thus enters the story as part of an infrastructure of maritime power: the coast is not merely passed but incorporated into a chain supporting long-distance travel and control.

Navigation and Rival Routes

The route around the Cape is one answer to the dangers of ocean navigation. Charts are vague, longitude cannot be fixed, and a pilot’s rutter—an accumulated record of courses, depths, winds, currents, hazards, and places to water or careen a ship—can make the difference between a passage and being lost. Such navigational knowledge is valuable and politically guarded. Portuguese and Spanish authorities treat rutters for overseas waters as national treasures, while their Dutch and English rivals seek them.

Blackthorne contrasts the Portuguese route with Spanish passages across the Pacific by way of Magellan’s Strait, or across the Isthmus of Panama overland. His own voyage used the Strait of Magellan to avoid Portuguese forts and the hostile sea lanes they controlled. Africa’s coastal network therefore helps explain why the choice of route is also a choice about exposure to rival power.

Strategic Knowledge

When Blackthorne describes the Portuguese forts to Toranaga, he adds that many employ Japanese troops. He learned this from a Spanish friar hostile to Portugal and the Jesuits, and stresses the information as a practical disclosure rather than an abstract account of geography. The forts connect distant coasts to Japan’s political calculations: knowledge of their positions and personnel could matter to a ruler assessing Portuguese influence and the routes by which foreign powers reach Asia.