I had this idea to make a sunset kind of river scene, so here you are (WIP). In the distance the low marshy lands end into a row of dunes before the river flows into sea. The Roman border road lies alongside the river, a watchtower every few hundred meters (edited pop). Maybe I'll add a boat or two, a castellum, and change the vegetation. The encircled river area lacks depth, and I have to set that right, as I want a continuous glowing river.
This (detail 0.6, AA 6, soft shadows, masked out water areas) took 1hour and 17mins on an i7.