You're most likely to find smooth, rounded rocks in places where they've been exposed to a lot of abrasion and weathering. Here are some common locations:

* Riverbeds and beaches: The constant movement of water and sand grinds down sharp edges, creating smooth and rounded rocks.

* Glacial valleys: Glaciers act like giant sandpaper, dragging rocks over the landscape and smoothing them out.

* Deserts: Windblown sand can also cause abrasion and round out rocks over long periods.

* Mountain ranges: Even in the mountains, where rocks are exposed to the elements, wind, rain, and ice can create rounded shapes over time.

The degree of smoothness and roundness depends on factors like the type of rock, the intensity of the forces acting on it, and the duration of exposure.