According to Spykman's Rimland Theory, which area is strategically most important for controlling Eurasia?

According to Spykman's Rimland Theory, the area strategically most important for controlling Eurasia is the Rimland itself. Nicholas Spykman, a Dutch-American geostrategist, developed the Rimland Theory as a critique and modification of Mackinder's Heartland Theory. Spykman defined the Rimland as the coastal areas surrounding the Eurasian Heartland. This includes Western Europe, the Middle East, South Asia, and Southeast Asia. Unlike Mackinder, who emphasized the importance of the landlocked Heartland, Spykman argued that the Rimland was more crucial because it was ....