Jortsku Cave Natural Monument (Georgian: ჯორწყუს მღვიმე) is a karst cave located 5.5 km to the north of village Second Balda in Martvili Municipality in Samegrelo-Zemo Svaneti region of Georgia, 653 meters above sea level.

Jortsku Cave has two storey and maximum length of 276 m. Large entrance hallway leads to a meandering corridor, 3-5 m high and 4-5 m wide.

Further inside, about 100 meters from the entrance, two branches emerges, one of which opens to the second floor with 30 m long hall.

3.5 to 4 m thick plastic clay is in abundance in the cave hall.

[3] Paleontological findings established presence of cave dwellers in an ancient past.