Some years ago my son and I rode to the Canadian Rockies from Lander, WY ending in Jasper, Alberta, Canada (with a trip a bit further to Miette Hot Springs). On the way we stopped at Golden, BC and stayed a couple of days sight-seeing. Golden is located where the Kicking Horse River joins the Columbia River and the Columbia is a really big river at that point. If I remember correctly, Golden was as far as the ocean-going steamers/paddleboats could go upstream on the Columbia and they were 1,500 river miles from the ocean. That's a helluva river. I'm a geologist and one of the marvels of geology in the area of your photo are the "scablands". It took years for geologists to figure out the morphology of the area (how it formed) because the scale of the erosional and depositional features was so large it initially made no sense. They finally pieced together the story to discover that an ice dam had formed across the Columbia during an advance of the continental ice sheet and it held back a massive freshwater lake. When the ice dam suddenly gave way an absolutely stunning amount of water was released which caused all the massive fluvial features you see today. I think geology is cool but I may be somewhat biased .