It is located on the south face of Uludag in Kocayayla, 4 km from Keles district. Kocayayla, which is 65 km from the center of Bursa, has an altitude of 1,225 meters and an area of 40 decares. Osman Gazi used as a camp by establishing his tent and also according to a rumor, the weddings of  Orhan Gazi and Nilüfer Hatun was done here and has a historical importance. Kocayayla, which hosts the Cultural Festival and the Turkish World Ancestors Sports Festival, is open to visitors at all times of the year. There is a picnic table, barbecue, playground, masjid, camping and caravan area and wc facilities to have a picnic.