Thanks for the advice everyone.
I'm not sure about the bog/marsh idea. I think it would look at bit strange. Especially with the depression. Can I ask why not a small water feature? Is the basin too high? I'll be using varnish instead of water effects so I didn't want it too high.
Any way, I've not made a massive amount of progress with this. It'll not probably be next weekend before I get the chance to spend anymore time on it.
I have been playing around with the board with the river bend on it. My plan was to have one side as being more upland than the other. Again I'm open to comments and critiques here... should I add more uneven ground for example.

I like the valley that the two hills have created. It will look even better when smoothed out with filler. Ambush, do I hear you say?

