This study attempts to establish the strategic importance and value of Spain in relation to the defense of Europe. The research has been done through four different approaches consisting of analyzing successively: the position of Spain in the light of the main geopolitical theories, the geographic features of the country, the most significant events of the Spanish history, and the possible role to be played by Spain in the current political confrontation between the East and the West. The conclusions reached through the four different approaches confirm and point out the critical strategic importance of Spain in the European scenario and can be summarized in these statements: -Who rules the Heartland and the Iberian Peninsula simultaneously, controls the western Rimland. -Who rules the Heartland and the western Rimland, control the World Island. -Who rules the World Island, controls the destiny of the World.