Rim Ocean

The Rim Ocean, from the Morporkian view, is the ocean into which the Circle Sea empties. It continues from there to the Rim and around Klatch to beyond the Orohai Peninsula and Kythia, where it opens into the Widdershins Ocean. In the other direction, the name changes to the Turnwise Ocean rather arbitrarily, somewhere around the Brown Islands.

It flows over about half of the Disc's perimeter; about half of this length is protected by the Circumfence.