The St Anthony Channel, also known as the
`ibenik Channel, is part of a wider area Channel  Port, a significant landscape protected in 1974. It is more than 2000 metres long and between 140 and 220 metres wide. It serves as the door of
`ibenik to the open sea and as the entrance to the town. The channel represents the place where the river Krka symbolically ends but at the same time it is the place where the river flows into the Adriatic Sea. While paddling towards we arrive to an attractive undersea tunnel which was built by the Yugoslav Army. The tunnel was dug into the bedrock and it is several hundred metres long. In its immediate vicinity there is an old pier and a cave in which there was a small church dedicated to St Anthony. On the eastern side of the channel, just in front of the cove and
`kar Beach, the Yugoslav Army built a military complex comprised of barracks, warehouses, jetties and related infrastructure. At the exit of the channel towards the open sea there is a pearl among Venetian fortifications  St Nicholas Fortress. This fortress, almost completely surrounded by the sea and largely preserved in its original form, is one of the most attractive fortifications in the Adriatic.Benedictine monastery of St Nicholas after which the fortress was named. It was built as an important Venetian strategic point after Skradin had fallen under Turkish control in 1522.