Zalesina is located in the City of Delnice, in Primorje-Gorski Kotar County at an elevation of 760 meters above sea level and it covers the area of 6.85 km² (2.64 sq. miles). According to the 2011 census report, there were 41 inhabitants. It is predominantly populated by Croats (95%), but also. Nearby places: Šijska Kosa, Kupjak, Leskova Draga, Dedin, Stari Laz, Šije, Hlevci, Rogi, Podstena and Ravna Gora.