Križna jama

Križna jama is an 8,273 m long cave system below the triangle between Bloke plateau, Loško polje, and Cerkniško polje. The entrance is located 1.5 km south of Bloška Polica. Named after the nearby Holy Cross Church in Podlož, the cave is known for its chain of subterranean lakes with emerald green water. It is the fourth-largest known cave ecosystem in the world by biodiversity. First documented in 1832, with engravings from the 16th century, the lake and stream passages were first explored in 1926.

At Kalvarija (Cavalry), the cave splits into two branches: Blatni rov (Muddy tunnel) to the north and Pisani rov to the northeast. Due to slippery mud, most explorers continue through Pisani rov to Kristalna gora (the largest hall) or Matjažev rov. Water from Križna jama continues through a deep siphon to Nova Križna jama.

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