 Lake Suguta overflowed through this sill into Lake Turkana.Overflow over this sill controlled the lake levels at highstand; that it is higher than the highstand shoreline is most likely a consequence of the tectonic tilting of the basin.In addition, it is likely that during the highstand of Lake Suguta the Lake Baringo farther south overflowed into the Suguta River drainage basin, while Lake Turkana overflowed into the Nile.