Where does the European Plain begin and end?

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The European Plain is one of the most significant uninterrupted expanses of flat terrain on Earth. It begins in the west at the Pyrenees Mountains, which form the border between France and Spain, and stretches eastward across northern Europe until it reaches the Ural Mountains in Russia.1

While the plain is relatively narrow in Western Europe—rarely exceeding 200 miles (320 kilometers) in width—it broadens significantly as it moves eastward, reaching its greatest width of more than 2,000 miles in western Russia. The western and central sections are often referred to as the North European Plain, while the eastern portion is known as the East European Plain.12