One of the main features of the Western Siberian Plain is that it

A. is the largest plain in the world

B. covers the majority of eastern Russia

has a very low population due to its harsh climate

D. slopes upward from the coast down to the southern portion of the region

A. is the largest plain in the world

West Siberian Plain, Russian Zapadno-sibirskaya Ravnina, one of the world's largest regions of continuous flatland, central Russia. It occupies an area of nearly 1,200,000 square miles (3,000,000 square km) between the Ural Mountains in the west and the Yenisey River valley in the east.

A. is the largest plain the world

The Western Siberian Plain is the largest plain in the world.