The "Šopur" spring is located on the Ozren mountain, on the way to the village of Jezero, and is 10 km away from the centre of Sokobanja. The spring is surrounded by beech forest, and a picnic area is arranged around it. From Šopur, along forest paths, you can reach the top of Oštra čuka (1075 m), from where there is a magnificent view of the Sokobanja valley and the mountain Rtanj. Sharp hammer is one of the peaks on the Virgo mountain. The ascent is moderately demanding and takes about an hour. The top of Oštra čuka is rocky and steeply cut off on all sides, except on the north side, where the only possible ascent is with a much milder slope. The top itself is small and resembles a "stone nest". From the top, there is a view to the south to Suva Planina, and it is possible to see the Nis airport. In the north, you can see the mountains Beljanica, Veliki and Mali Malinik. On the west side, you can see Veliki and Mali Jastrebac.