From D'ni Zoological Society
Comments: Eder Gira from the waterfall
Eder Gira is a volcanic scrap of land, dotted with steam vents and a waterfall. A number of bone structures dot the landscape, and a series of inter-connected dark passageways run through the back ridge, behind the waterfall. Small, manta-ray-like creatures can be found swimming in the pond below the falls, and baskets arrayed around the caves in the rear of the Age indicate that at one time this Age may have featured fishing as a distraction from everyday life in the Cavern.
In the distance it is possible to see a forest with numerous birds. In the middle of the forest are ruins. Whether these ruins belonged to D'ni who visited the Age or the Age's inhabitants is currently unknown. The DRC project status page indicates that there is a second area to this Age which is currently in a suspended state; there is no information whether this area is related to these ruins.
The presence of the volcanic rift in the near center of the traversable area, combined with the plentiful gaseous vents, indicate that the area is seismically active. The watersource for the area is in the general area of the large structure at the top of the mountain, which could indicate that it is a geothermal-powered generator of some kind.
Ecologically, there are indications that the vents and their related gases are detrimental to all but a few hardy plants. This may be by D'ni design or by centuries of adaptation.
Eder Gira is also one of the few Ages we've seen with a normal day/night cycle. As discovered by Tehl Nava and Gadren, a full day on Gira is 10 hours long.