I have photographed many rapids, mostly in Lapland, where waters are crystal clear. This is a small river close to our family place in Kainuu, Central-Eastern part of Finland. Here water is dark, almost black. I like it in the pic, perhaps more than clear waters. Even if water is dark, this river is a very good brown trout river. M son fly fished a 3 kg trout here from some yeas back. He still shaking when telling about that catch.