The protected landscape of the Channel-Harbour encompasses the area from the Šibenik Bridge to the end of the Channel of St. Anthony, more precisely to the fortress of St. Nicholas with the accompanying surrounding sea area. No one has yet passed through the Channel of St. Anthony without experiencing awe at this rare sight of beauty.

The channel is just over 2000 m in length. Its width at the entrance of the channel is 220 m, which the smallest width is 140 m. Its depth is between 20 and 40 meters.