It extends 65 kilometres (40 mi) inland from the Sound of Bute, making it the longest of the sea lochs in Scotland.

A vehicle ferry traverses the loch to Tarbert on the Kintyre Peninsula on the west shore.

[3] During the Second World War, HMS Quebec (a shore establishment) also known as the "No 1" Combined Operations Training Centre (CTC) was centred a few miles south of Inveraray and used the shores of the Loch Fyne and surrounding coastline.

This important military facility was set up in October 1940, around 250,000 personnel passed through the training centre by 1944.

[4] Dolphins, seals and otters inhabit the loch, and basking sharks can appear in its waters during the summer months.

[citation needed] In 2014 Loch Fyne was declared a Nature Conservation Marine Protected Area (NCMPA).

[6] It is also notable for its herring-fishing industry, and hence the famous Loch Fyne Kipper, originally caught using the drift-net method.