The reservoir is 129 km long and is located in the Dnipropetrovsk and Zaporizhzhia Oblasts. It stretches from the dam at Zaporizhzhia upstream to just below Dnipro city. It averages 3.2 km wide, and is 7 km at its widest.
It is an average 8 meters deep and 53 meters at its deepest. The total water volume is 3.3 km³. The Samara Bay, stretching for approximately ten kilometers at the mouth of the Samara River, flows into the northern end of the reservoir.