KAFOS (Karadeniz Fiber Optik Sistemi - Black Sea Fibre Optic System) is a submarine telecommunications cable system in the Black Sea linking Romania, Bulgaria, and Turkey.

It has landing points in:

• Mangalia, Romania
• Varna, Bulgaria
• Istanbul, Turkey

it has a transmission capacity of 8 Tbit/s, and a total cable length of 504 km. It started operation on 13 June 1997.

• https://web.archive.org/web/20070930122255/http://foptnet.ge/map2eng.htm Map of the cable system (3 Systems BSFOCS, KAFOS, & ITUR)