Floating Isle

From MTG Salvation Wiki

The Floating Isle was the island on Ulgrotha where Feroz began his Wizards' School. The island does not actually "float", as it's name would suggest. It is an island like any other. Feroz controlled the growth of coral, and now a great reef encircles the island, with only one wide channel that leads to Port, a port city outside the Wizards' School.

The island was originally a port for the Sea Dwarves.