It is located 6 kilometres north of Kočani, at the base of Mount Osogovo and at the northern coast of Lake Gradče.

In the early Antiquity, this area, which is geographically connected to the course of Bregalnica River or antic Astibos, was part of Paeonia, colonized by the Paeonian tribe known as the Derrones.

The excavations in 2004 were the first exploring activities with a purpose to prevent the site from the construction of the local road which connects Kočani to the village Jastrebnik.

The fortification occupies an area of around 1,5 ha and has wide defensive walls that enclose an irregular form with dimensions of 200x100/50 meters.

It is important to mention that medieval sgraffito plates and objects made of tilled animal bones were also found here.