Loch Long

Loch Long is a body of water in Argyll and Bute, Scotland. The Sea Loch extends from the Firth of Clyde at its southwestern end. It measures approximately 20 miles (32 km) in length, with a width of between 1 and 2 miles (1.6 and 3.2 km). The loch also has an arm, Loch Goil, on its western side.

Loch Long
Looking down Loch Long from the torpedo testing facility. The houses to the left are at Ardmay.
LocationCowal, Argyll and Bute, Scotland.
Coordinates56.034395°N 4.8855839°W / 56.034395; -4.8855839, grid reference NS2031486146
TypeSea Loch
Basin countriesScotland, United Kingdom

Loch Long forms part of the coast of the Cowal peninsula and forms the entire western coastline of the Rosneath Peninsula.

Loch Long was historically the boundary between Argyll and Dunbartonshire. However, in 1996 boundary redrawing meant that it moved wholly within the council area of Argyll and Bute.

Villages on Loch Long

Villages on the loch include Arrochar at its head and Cove on the east shore near its foot.


Several Scottish sea fishing records are attributed to the loch:

SpeciesWeightAngler / Date
Argentine00-05-03I. Miller, 1978 (Boat)
Herring01-02-00R. C. Scott, 1974 (Boat)
Rockling, Shore00-14-08A. Glen, 1982 (Shore)


The Ardentinny Outdoor Education Centre on the western shore uses the loch for watersports.

It is now a popular area for diving on the numerous wrecks that scatter the loch.

Finnart Oil Terminal

The Finnart Oil Terminal is located on the eastern shore of the loch, linked to the Grangemouth Refinery via a 58-mile-long (93 km) pipeline.[1]

The eastern shore is also the location of the Royal Navy's Coulport Armament depot, part of HMNB Clyde, and the Glen Mallan jetty, linked to Glen Douglas defence munitions depot.

The loch was used as a testing ground for torpedoes during World War II and contains numerous wrecks.


  1. Fullarton, Donald (29 July 2011). "Americans built oil terminal". Helensburgh Heritage. Retrieved 23 May 2013.
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