Most of the terrain consists of a large body of icy water, cold enough to even pierce through any sort of cold resistance that Link is wearing on him at the time. Furthermore, Link should avoid swimming in the water at all costs as he will take damage very quickly from the very cold water. Link should also not come to this place unless he is wearing cold-resistant clothing, such as a Warm Doublet, the "Snowquill" set of armor, or have cold-resistance food and elixirs on hand before entering the area.
On the eastern mainland, there is what appears to be a destroyed cottage of wood with a non-functioning Guardian. To the right of the destroyed cottage, there is a Cooking pot for making any cold-resistant foods or elixirs. On top of the boxes, Link can find a Korok Leaf and Link should use it for steering the raft and sailing between the two mainlands. That necessity would be nullified assuming Link has Revali's Gale, since he'd be able to fly across the body of icy water, if he has any charges left.
On the western mainland stands the Keh Namut Shrine, which houses the Cryonis Rune and a small body of water next to the Shrine, which is also consistent of icy water. On the southern mainland, there is the range of Mount Hylia and on the northern side leads to Hopper Pond and the Forest of Spirits.