Vadediji is located in the municipality Žminj, in Istra County at an elevation of 308 meters above sea level and it covers the area of 1.92 km² (0.74 sq. miles). According to the 2011 census report, there were 64 inhabitants. It is entirely populated by Croats. Nearby places: Kresini, Krničari, Tomišići, Modrušani, Debeljuhi, Mužini, Bašići, Kršanci, Matijaši and Žminj.