ggh did. balthasar_s ENHANCEd it. (The river10 which crosses the bluecave and fills the lake meets the sea1 about where they cast off.)
… the oars?
Spoiler:
There are some drops falling from them, but just a few. (azule, ucim, SilentTimer, and azule again noticed.) Ms. Frizzle knows how to row a boat efficiently, without big splashing.