50 millions years ago, during the Bloxxy-Meateor Period, a astroid 4 miles wide hit Ro-Earth. The impact caused huge mountains. The Bricky mountains is the Eastern side of the crater. 10 million years later, a Ice Age hit. It formed 78 percent of the water. Then, in 1344, another Ice Age (a.k.a., Little Ice Age) brought the rest in. There are many tales, including the Great Cave. No one has truly found it.