People have pointed out the terrain issues, but I encourage you to actually look up the Panama Canal on like Google Maps.
You’ll see that the excavated canal is actually a pretty small part of its length. When you go through the Panama Canal, most of the trip you’re actually traveling through a large mountain lake, Gatun Lake.
The canals and the locks are mostly just to get you from sea level up to the level of this lake, and then back down.
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