Ultimate River Tool is powerful and easy to use component for Unreal Engine 4 that allows you to make rivers with automatic flow-map generation. All you need is to make a spline at your map and configure it scales.
Get it here!
The package includes high resolution forest assets: river component, realistic grass, translucent water shader with distortion and caustics, 8 tree types, 4 types of bushes, 3 types of grass, 3 types of flowers, 6 types of stones, 2 types of snags, 4 stumps, 1 hill, 1 background mountain model, 1 cloud fx, 1 magic leaves fx, blowball effect. A sample scene to get started is also included in the bundle.