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Do you have freestone rivers in Scotland ? Sounds a bit American that .....
A bird can fly but a fly can't bird
Freestone sections to be found on the rivers Tay, Tummel, Tweed, Don......
Any loose stone and grit based erodable spate rivers and streams fall into this category.
Lat/Lng: 56.6, -4.2
OS grid ref: NN6558