Loch Crinan is a seawater loch

Loch

Loch is the Irish and Scottish Gaelic word for a lake or a sea inlet. It has been anglicised as lough, although this is pronounced the same way as loch. Some lochs could also be called a firth, fjord, estuary, strait or bay...

 on the West of Scotland

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

, leading into the Sound of Jura

Sound of Jura

The Sound of Jura is a strait in Argyll and Bute, Scotland. The Gaelic name means "Sound of Disappointment". It is one of the several Sounds of Scotland....

 and being the western end of the Crinan Canal

Crinan Canal

The Crinan canal is a canal in the west of Scotland. It takes its name from the village of Crinan at its westerly end. Nine miles long, it 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...

. The village of Crinan is at the entrance to the canal at the eastern end of the loch. Duntrune Castle

Duntrune Castle

Duntrune Castle is located on the north side of Loch Crinan and across from the village of Crinan in Argyll, Scotland. It is thought to be the oldest continuously occupied castle in Scotland...

 stands on the northern shore. The River Add

River Add

The River Add is a river which runs through Argyll and Bute on the West of Scotland. It passes through the Mòine Mhòr Nature Reserve then ends at Loch Crinan by the hamlet of Bellanoch, where it is crossed by an 1851 cast-iron bridge.-References:*...

goes into it by the hamlet of Bellanoch.

It contains the islets of An-unalin, Black Rock, Eilean dà Mhèinn, Eilean Glas, and Eilean nan Coinean.