Swimming in the Nant Llech River, behind Wales Ape and Monkey sanctuary.
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You're right about the parotoid glands. You'll also notice the hind legs are shorter than a frogs legs.
Lat/Lng: 51.796765702234, -3.6892175674438
OS grid ref: SN836122
Nant Llech (SSSI), the woods behind Wales Ape and Monkey Sanctuary, near Henrydd Falls.