Across the street from the bento box lady and Petit-Voyage on the 81 is a historical placard and some stone work. This is apparently the entrance to an old natural spring complex. From the 81, you can go down the steps and then run into the fence-line for Foster. This site shows the entrance: http://withoutasound.web.fc2.com/ginowan/kiyuna_gusuku_site/index.html. We went looking for the Chuunuga spr
ing, to see if it could be visited from inside the base perimeter. Turns out it is located behind the recycling dump area and a parking area for Marine Corps buses, at the most southern part of Foster (where is abuts the 81). The spring unfortunately is fenced in. There look to be two or three different water spouts and a collection of ponds and waterways. We saw a turtle swimming in one of them. A stone path connects the spring with the entrance point on the 81. As you walk along this hillside, you discover old foundations of buildings and tombs, including a very pretty old turtleback-style tomb. You can almost feel the vibracy of the 
pre-war Okinawan community that lived, worked, bathed, and died in this area.
ing, to see if it could be visited from inside the base perimeter. Turns out it is located behind the recycling dump area and a parking area for Marine Corps buses, at the most southern part of Foster (where is abuts the 81). The spring unfortunately is fenced in. There look to be two or three different water spouts and a collection of ponds and waterways. We saw a turtle swimming in one of them. A stone path connects the spring with the entrance point on the 81. As you walk along this hillside, you discover old foundations of buildings and tombs, including a very pretty old turtleback-style tomb. You can almost feel the vibracy of the 
pre-war Okinawan community that lived, worked, bathed, and died in this area. 