the most significant geographical feature of central asia is question 50 options: the great vilayet sea, an inland sea that stretches for over a thousand miles from what is now russia into northern iran. the great eurasian steppe, a set of broad, flat grasslands that reach from eastern europe to the region of mongolia to the north of china. the great sahara desert, a massive set of deserts that have long prevented the people of central asia from having much contact with europe. the dead marshes, a set of swamps stretching for hundreds of miles in every direction. they are known as the dead marshes because the bodies of those slain by genghis khan in 1206 and ordered thrown into the swamp can still be seen today.