As such, a fair bit of the terrain I work on represents the Delta area and rivers are a major portion of that. As I've said before, I use GHQ Terrain Maker hexes, despite not being all that happy with it as a product. There's far too much variation in exact size and shape from hex to hex and it's way too much trouble to try to alter every single hex. But, I've yet to find a better, but still affordable alternative.
So, we begin with a 1/4" hex, which I smear with a liberal coating of Flexpaste
GHQ hexes don't fit together as seamlessly as I want, but it'll do until I find a better alternative.
Ok, back to the work bench!!