Glaciers come to mind. Their movements over hundreds or thousands of years can
abrade rock and debris from their substrate to create landforms such as cirques [enclosed valleys from which the glacier scooped up earth], moraines [accumulations of this earth deposited elsewhere], or fjords [narrow inlets surrounded by steep cliffs].
Gone fishing
If you ever fished in the Great Lakes and reeled 8n some perch or walleye, thank the glaciers from the last Ice Age. The Lakes are basically large versions of cirques that became filled with water. From Wikipedia:
The Great Lakes began to form at the end of the Last Glacial Period around 14,000 years ago, as retreating ice sheets exposed the basins they had carved into the land, which then filled with meltwater.[1]
The Great Lakes basin is limited in size because it tends to be walled off by the surrounding moraines from those same glaciers, but the waters in that region flow directly into the Atlantic Ocean without passing through Hudson Bay or the Gulf id Mexico as they otherwise might have done. Thus we have an example of the glaciers affecting a natural process across a continent.
Cited reference
1. Cordell, Linda S.; Lightfoot, Kent; McManamon, Francis; Milner, George (2008). Archaeology in America: An Encyclopedia: An Encyclopedia. ABC-CLIO. p. 1. ISBN 978-0-313-02189-3. Link