Sea of Ice

While not technically considered a proper Sea, the ice cap between the Seas of Air and Water is typically referred to as the Sea of Ice in even formal contexts. Its ecosystem is just as unique as that of any Elemental Sea, and just as dangerous as well.

Ice is not officially recognized as an element, so none of its qualities can be ascribed to the ice cap. Neither traits of Air nor those of Water seem to appear in its environment, either—its stagnancy and insistence that its inhabitants mold themselves to it are more in line with the character of Earth.

Geography

The Sea of Ice is ringed with free-floating icebergs that grow more common as one approaches the ice cap proper. While there are several landmasses within the Sea, the thick ice sheets and perennial blanket of snow make it difficult to determine whether one is standing on solid ground or floating ice.

After a point, the landmasses disappear entirely, leaving nothing but a shelf of ice stretching to the northern edge of the world. Due to extreme temperatures, no one has been able to determine if the land returns at some point.

Ecosystem

On the landmasses, northern animals that might be at home in the tundra of Astra manage to eke out a living on sparse, cold-resilient plants. Beneath the ice sheets, fish and seals swim alongside Shallow Sea Serpents and Crakes. Storm Wyverns live on the ice sheets, breaking fishing holes in the ice in order to hunt much as their brethren of polar bears do.

The top of the food chain is, of course, the Ice Dragon. These dragons are not picky in their meals, and are just as likely to pursue a wolf as they are a polar bear or Wyvern, or even a Sea Serpent or Crake if the opportunity provides itself.