TrebišnjicaTrebišnjica – Herzegovinian sinking river, one of the biggest of such kind in Europe. It is 96.5 kilometers long, springs at an altitude of 398 meters. The waters of the Trebišnjica river also appear as the source of the Dubrovnik river Omble, and the largest part goes by underground flow into Neretva. The area of the Trebišnjica River basin is one of the richest areas when it comes to precipitation in Europe. One year average is 1,800 mm. In vincinity of Trebišnjica basin there is a place Crkvice which has the highest level of rainfall in Europe, an average of 4.900 mm per year.
