Here's a quick set-up with some of the new boards placed on top. Obviously the addition of some trees, buildings and other scenery will enhance things, but this is the basic look I was after.
With a row of terrain squares removed the river can be widened, allowing for the off-cut islands to be used. I think this will offer me plenty of flexibility and options for different types of battlefield. I can do a large bay or inlet, a big central island, as well as straight or winding rivers. As I'm aiming to get my post-Napoleonic Sharp Practice project ready to play this year, I think a bit of water, with the odd bridge or boat, will make things interesting! These rivers, like the rest of my terrain, are designed to be used for all scales I play with, from 6mm to 28mm, and I'm looking forward to getting plenty of use from them.