The content begins with a study of Spain at the time of the first round the world and the nautical and geographical knowledge of that period. Likewise, a detailed relation is made of Portuguese discoveries and expeditions developed in the 15th and 16th centuries, which lead Portugal to the entrance of Spice Islands, and the Spanish expeditions of that time with reference to the Colombian and Andalusians trips, as well as the various voyages until the discovery of the Pacific Ocean and the River Plate.
The essential part of the volume is dedicated to what was the trip itself and to the action of the main protagonists, so that based on the initial biographical data of Ferdinand Magellan, are exposed his coming to Spain, the capitulations signed with Charles I, the preparations for the expedition, the route through the Atlantic and Pacific oceans to the Philippines (where Magellan dies) and the Moluccas. The story continues with the leadership of Juan Sebastián Elcano, who culminates the circumnavigation after three years. An extensive and updated bibliography provides complementary information for the reader who wants it.