There are unique lakes in the world that are classified as terminal lakes or endorheic, meaning no drainage or only inflow, which retain water and have no outflow. An example is the Great Salt Lake in Utah, USA, where the Jordan, Bear, and Weber Rivers empty into the lake. Due to the lake being endorheic (it has no outlet besides evaporation), it has very high salinity, far saltier than seawater, and its mineral content is constantly increasing. Although the salinity gradient between the lake and the inflowing rivers is enormous, suggesting a very promising potential for energy generation, the salinity of the river water is so low that the internal stack resistance would be very high, reducing the potential power generated. Upon further investigation, this may not pose to be a huge problem, because one simple solution is to slightly pre-mix the river water before using it in a RED stack. These are the types of questions that need to be further investigated on a site-by-site basis.