The City Above is the half of Overlook on top of the cliff face. Most of the nobility lives here. The Duke in particular lives on a small island in the middle of the great river, about half a mile from the falls.
By law, no waste can be dumped in the river in the City Above, so the water remains crystal clear until it reaches the falls, and is the primary water source for the city. However, there are no convenient aquifers, and so the parts of the city farther from the fresh water quickly become the poorest slums in all of Overlook.