Manufacturer website link:
https://www.bonaldo.com/en/product/river 
Model: Bonaldo River Bed
_A high quality model with clean topology and unwrap for your render
Polys: 626.490 Verts: 625.517
Non_collapsed turbosmooth for max file
_One bed frame, two different Material options
_ Units: Millimeters
_ UV Mapped: Yes
_Render: V-Ray 3.6 Corona 1.7
_ Formats: 3Ds Max 2015, OBJ
_ other models
https://3dsky.org/users/mz_3dbed