Hello:
Your setting is a Lovecraftian Pirate Fantasy setting, right? The oceans, seas, rivers, streams, etc should reflect this in some manor. This can be accomplished by adding to their names the words:
Dark, Murky, Shady, Sinister, Evil, Threatening, Menacing, The Master's, Darkness, etc.

A few examples:
The Dark Ocean
The ominous river
Threatening Stream
Then use a translation program an put them in another language.

Example:
illevarslende elv is ominous river

I hope this has helped.

Tracker