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The Narrow Sea is the sea that lies to the east of Westeros. It separates Westeros from the larger continent of Essos to the east. The sea is relatively narrow passing east to west between the continents and easy to cross, hence its name. However, while it is narrow enough to allow commercial shipping and cultural transmission to pass between the two continents, it is large enough to make large-scale invasions and military incursions between the Seven Kingdoms and the Free Cities difficult.