Took a look at your first post...
Panama is a very flat country. With nearly 2500 km of shoreline and only 75,000 km2 of total area, there isn't much opportunity for tall mountains
Perhaps no super tall mountains here but I would say Panama is most definitely not flat. If it were the canal would have been quite a bit easier to construct.
@mynameisbrian: I come and go.
You're right -- the locks would not be necessary if Panama was perfectly flat. However, real mountains are few and far between.