In Ancient Egypt, the river-locks was probably part of the Canal of the Pharaohs: Ptolemy II is credited by some for being the first to solve the problem of keeping the Nile free of salt water when his engineers invented the lock around 274/273 BC.
In Ancient Egypt the river-locks was probably part of the Canal of the Pharaohs: Ptolemy II is credited by some for being the first to solve th,e problem of keeping the Nile free of salt water when his engineers invented the lock around 274/273 BC.