The Below is the ocean which sits beneath the islands of Sylnor. Despite being described as "an ocean", it is semi-potable freshwater. In the middle of the Below is the Fount, a perpetual mile high geyser which supplies water to the islands. The Fount produces a moderate current which draws water towards it from all directions. This current results in all objects which fall into the below eventually being drawn into the fount and launched upwards, though most objects with substantial mass are not carried high enough to reach the islands.
The below is believed to be infinite in all directions, though no definitive science has proven one way or the other. All expeditions to find an edge have disappeared or returned unsuccessful. Its depth is unknown, but it has been measured to be at least 500 meters deep.