Crinan Canal, sea lock

The Crinan Canal between Crinan and Ardrishaig in Argyll and Bute in the west of Scotland is operated by Scottish Canals. The canal, which opened in 1801, takes its name from the village of Crinan at its western end. Approximately nine miles (14 km) long, the canal connects the village of Ardrishaig on Loch Gilp with the Sound of Jura, providing a navigable route between the Clyde and the Inner Hebrides, without the need for a long diversion around the Kintyre peninsula, and in particular the exposed Mull of Kintyre
It was designed by civil engineer John Rennie and work started in 1794, but was not completed until 1801, two years later than planned.