Interior niche with central fountain, flanked by putti and a vase, each on a pedestal. Large fountain resting on pedestal with masks. Fountain has nude female figure holding reins of a sea monster spewing water. Birds and satyrs decorate the upper portion of the fountain with reeds and other plants. Central female figure at top with arms raised spews water from mouth. In the sky, putto rides an eagle; above, grouping of fish, nets, eels, and a triton.