The name of the new realm formed by the Unification of Koskant and Denning, suggested by Reliable Chandler, secretary to Realmgold Determined. The name is after the river which formed the border between the two realms, and now runs down the middle of the united realm. Denning was to the north and west of the river, Koskant to the south and east.

The seal of Koslin is a river fish.

Capital: New Koslinmouth, on the formerly Koskant side of the river from the existing Southcliffs capital of Koslinmouth.