Cross Cave[2] (Slovene: Križna jama, German: Kreuzberghöhle[3]), also named Cold Cave under Cross Mountain (Mrzla jama pod Križno goro), is a cave in Slovenia's Lož Valley, in the area between the Lož Karst Field, Cerknica Karst Field, and Bloke Plateau.

Extremely slow-growing calcareous formations (up to 0.1 mm per year) and their fragility are the main obstacle to large-scale tourism in the cave and limit daily tourist visits to the flooded part of the cave to four people.

Since the 1990s, it has been cared for by the Friends of Cross Cave Association (Društvo ljubiteljev Križne jame).

On January 6, 2024, five people were trapped in the cave due to high water levels caused by heavy rainfall.

Continuing along the Variegated Passage, visitors enter the Crystal Mountain (Kristalna gora), the largest room in the cave.

They were found on a ledge elevated 10 m above the water level that always remains dry, located about 2 km from the entrance to the cave under Cross Mountain.