Klašnjica is located in the municipality Udbina, in Lika-Senj County at an elevation of 604 meters above sea level and it covers the area of 6.16 km² (2.38 sq. miles). According to the 2011 census report, there were only three inhabitants left. It is relatively populated by Croats (50%), but also. Nearby places: Frkašić, Vedašić, Bjelopolje, Tuk Bjelopoljski, Ponor Korenički, Grabušić, Jasikovac, Pećane, Oravac and Gradina Korenička.