Map edit question

[Fluffball]

I customized a map for Civ4. I made a lake by just plopping down some ocean tiles. Playing the game I can make work boats out of the city on the lake, but not any war ships. Any one know what I did wrong?

[Sullla]

Bodies of water must have at least 20 tiles in Civ4 to allow ships to be constructed. The exception is that work boats can always be constructed if a body of water contains a seafood resource.

[Fluffball]

Ah thank you. So much for my intense naval battles on a choke point lake.