: The Rimland serves as an "amphibious hinge," bridging land and sea power and acting as a buffer to prevent any single power from unifying the Eurasian landmass. Geopolitical Objectives for the United States
Spykman contends that the Rimland, which includes Western Europe, the Middle East, and East Asia, is the most critical region in the world, as it is the interface between the land power of the Eurasian heartland and the sea power of the Americas. He argues that the Rimland is the key to controlling the "Heartland", which is the central region of Eurasia.
The "Asiatic Mediterranean" (South China Sea) as a focal point of 21st-century geopolitics. Accessing the PDF
This is the enduring legacy. Spykman explicitly outlines what George F. Kennan would later call "containment." He argues for a ring of buffer states along the Rimland, military alliances (prefiguring NATO), and the economic resuscitation of Europe and Japan as bulwarks against the Soviet Heartland.
The Rimland possesses the highest population density, industrial capacity, and access to sea lanes, making it the primary theater for global power struggles. Key Arguments & Themes