Another free geomorph for you all. This one is a triple-size tile that details a section of underground river spanned by a bridge that leads to a small, well-defended hideout. I've included at least two possible ways to bypass the main bridge, and hints that this could just be the front entrance to a much larger complex. Find the rowboat and take a ride down the river to parts unknown!
Enjoy -- and let me know what you'd like to see in future sets.
Link to PDF download