Boka, waterfall in the Boka Valley, Slovenia

Boka is a waterfall in the Boka Valley that descends through limestone formations in the Julian Alps with two main drops. The cascading flows come together to form a system shaped by the region's topography.

Boka is a karst spring, not a glacial feature: its water gathers in the Kanin range, flows underground and emerges on a rock shelf beneath an almost vertical limestone wall, then runs about 30 m before dropping. The fall keeps growing because the rock it strikes is less resistant than the ledge it pours over. The stream reaches the Soča in under a kilometre, one of Slovenia's shortest.

The stream and waterfall share the name Boka, and the whole course from spring to the Soča is under a kilometre, one of the shortest streams in Slovenia. The falls are seen from the Kobarid–Bovec road just before Žaga, and a parking area by the bridge over Boka Creek is the start of the gravel path. Despite carrying three times the flow of Savica, Rinka or Peričnik, Boka is less known than those falls.

A marked trail leads from the parking area near the main road between Bovec and Kobarid to the viewing platform. The route is easy to follow, but the terrain varies, so suitable footwear is recommended.

The water originates from an underground karst spring system that maintains a constant flow year-round, even during dry periods. This hidden source feeds the waterfall from deep within the mountain.