What is the single largest physical feature across Europe?

The single largest physical feature across Europe is the Great European Plain, which stretches from the Atlantic Ocean in the west to the Ural Mountains in the east. It covers an area of about 4 million square kilometers (1.5 million square miles) and includes the countries of France, Germany, Poland, Ukraine, and Russia. The plain is characterized by its low elevation, with most areas below 200 meters (656 feet) above sea level. It is also home to some of the continent's largest rivers, including the Rhine, Danube, and Volga.