How many gallons of water fill the panama canal?

The Panama Canal does not fill with gallons of water. The canal is a manmade waterway that connects the Atlantic and Pacific Oceans, and it maintains the same level of water on either side. The water in the canal is controlled by a system of locks, which raise or lower ships as they travel through the canal. The locks are filled and drained using a system of pumps, and the water is then released back into the canal.