Here's the deal:

Off the coast of a scorching biome, just into the NORTHMOST 3rd of a world with a SOUTH pole icepack... I found a giant ice island.

It is not flat. It has huge cliffs reaching up into the sky. And other flat areas around this.
It seems to suck up water from the surrounding area.
It has birds landed on the flat bits, and nothing else.

As it messes with the ocean's water levels, it thus eats framerate as a light snack.

For compatibility, this is a [url=href=http://www.bay12forums.com/smf/index.php?topic=52988.0;topicseen]Deon Genesis Phoebus 3.25d[/url] save.

here you go: