Milena and Neven Đenadija, parents of four children from Kostajnica, have created the animated series "Neva Without Borders", inspired by their five-year-old daughter Neva. The first episode, titled "Neva and
Every year in mid-October, Kostajnica celebrates the sweet chestnut with cultural, entertainment, and tourism activities dedicated to this local treasure. "Kestenijada" is a tourist-cultural-economic event held in Kostajnica since 1998.