The Skednena Cave lies at the northern edge of Planinsko Polje, east of Lanski Peak. It measures 209 metres and is 30 metres deep. It has three entrances: two vertical entrances through sinkholes and an abyss opening  near the south entrance. The cave runs from north to south and is tunnel-like. Owing to its sinkhole entrances and the forest above, which reduces the force of the wind, cold air accumulates in the cave and causes the development of ice stalactites and structured floors throughout the cave. Information and visits are available by prior arrangement from: .