As its name states, Riverside is located just beside the St. Johns River in Jacksonville, FL. This is an extremely beautiful area. The trees are huge. Be sure to visit the Cummer Museum where there are Live Oak trees on the riverfront with branches that are not only huge, but dip down into the ground and come up again. Amazing! The homes and gardens in this area are gracious and well maintained. Spanish Moss hangs from the trees. A quiet residential area by the river.See more..