Against the southern wall of the garden stood a nymphaeum. The nymphaeum had an aediula structure. It sat on a large podium and possessed a large central niche. On either side of the niche stood columns, decorated with painted red and yellow spiraling stripes. The top of the structure had a simple form, with a plain tympanum. The entire structure appears to have been originally painted, however the only photographs of the structure prior to its decay lack colour. The interior of the niche appears to have been largely white, with its ceiling painted a darker colour, matching the roof of the structure and the surrounding walls. From the niche a series of stone steps extended downwards, where water would have flowed into the rectangular pool below.