Toledo Aerial Media created this amazing aerial view of a phenomena on North America's Great Lakes called "ice mountains". This was filmed near Port Clinton, in the southwestern corner of Lake Erie. Lake Eris is the fourth largest of the five Great Lakes, with a surface area of about 25.7k square km (just under 10k square mi.). The southernmost of the chain, it generally does not freeze. During particularly cold winters, large ice chunks form and drift into gigantic "ice mountains".