Although commonly referred to as a mountain chain, the Carpathians do not actually form an uninterrupted chain of mountains. Rather, they consist of several orographically and geologically distinctive groups, presenting as great a structural variety as the Alps. The Carpathians, which attain an altitude over in only a few places, lack the bold peaks, extensive snowfields, large glaciers, high waterfalls, and numerous large lakes that are common in the Alps. It was believed that no area of the Carpathian range was covered in snow all year round and there were no glaciers, but recent research by Polish scientists discovered one permafrost and glacial area in the Tatra Mountains. The Carpathians at their highest altitude are only as high as the middle region of the Alps, with which they share a common appearance, climate, and flora.