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//river <block> <start> <end> [decline]
Uses convex selection.
Start and end = Depth of the river.
Decline = Steepness of the edges of the river (default = 1).
-s flag smooths out the liquid or snow layers.
-n flag adds noise to the river shape.
//river water 5 10
//river water 5 10 -n
//river water 5 10 -s
//river snow_layer 10 20 -sn