The Uzun Mera site was discovered in May 2017 thanks to a survey carried out by the Goce Delchev University from Shtip, on a location earmarked for the construction of an airport. The chosen location, locally known as Uzun Mera, is a flat area in the center of the Ovche Pole valley, SW of the Mustafino village. During an intensive survey Palaeolithic stone tools were noticed on a vast territory extending northwards over the local road leading to the village. It was established that, based on surface finds, the site spreads on an area of over 1,5 km2. Trench excavations followed during the same month, with trenches 1 to 3 positioned on a discreet elevation where the artefacts were first discovered. The trenches revealed similar stratigraphy, the only difference being the two trenches closer to the “peak” of the elevation containing a layer of gravel (mainly cobbles). This layer is high in the stratigraphy, at some points reaching the surface (in such areas cobbles were displaced by plowing). Below the gravel is a thick layer of loess-like silty layer, and occasionally there are lenses of sand and clay. The artefacts are present throughout the stratigraphy, with relatively higher density around the gravel layer and on the surface. The artefacts and the gravel are from a similar geological material. Technologically, the stone artefacts belong to the Middle Palaeolithic, including cores, flakes and instruments. Uzun Mera is only the second archaeologically excavated Palaeolithic site in the country. Being an open-air site makes it more complicated to investigate and certain issues, such as the site formation and exact chronology, remain to be answered in the following campaigns.