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Silk

This focuses on the Eurasian heartland from the central european plane across the hordelands to China. "Zones of contact" include Turkic groups, the Balkans, the caucasus and Anatolia.

Monsoon

This area beginnings at straights of Gibralter travels through the meditteranean to the Red Sea and into the Indian ocean and south China Sea. Essentially the Eurasian rimland.

Silver

This focuses on the areas of the world connected by the 16th century silver trade meaning Iberia, Mexico, Peru, Phillippines.