In which schemes the two basins are located apart and their waters are never exchanged?

The two basins located apart with no exchange of waters are typically found in endorheic (closed) basins and exorheic (open) basins. Endorheic basins do not drain to the ocean, with water only leaving through evaporation or infiltration, while exorheic basins drain into larger bodies of water, such as rivers or seas. These systems are often geographically separated by mountains or other barriers, preventing any hydrological interaction between the two.