Idrija river pool at Golo Brdo
The Idrija (Iudrio in Italian, not to be confused with the Idrijca) forms the Slovenian–Italian border in its upper course, and at Golo Brdo it carves a pool about 40 m long and 15 m wide under the hill of the church of St Mary 'on the lake'. It is a short, easy dive of up to 3 m: first the deep part under the bridge, where larger fish hide, then the shallow upper end by the rapids with a lively shoal of small fish that ignore divers. In the deepest part lie dressed stone blocks, probably from an earlier bridge. The whole pool can be seen in under half an hour.
depth: 0–3 m