If you travel north of the planes and into the water, an underwater cave can be found. Northern Plains – The Northern Plains are in the northern most region of the island which features a river that splits it in two. These plains are located between two mountains, the Whitesky Peak and the Frozen Fang. Three large Obelisksform a triangle on the Island. The Island consists of multiple climatic and geological regions. There are five larger mountains in the north and plains in the south.