Loch Lomond vs Loch Ness: size, distance and which to choose

Loch Lomond or Loch Ness? Pick Loch Lomond if you are based in Glasgow or Edinburgh and have a day: its south end is 34 minutes’ drive from Glasgow, with direct trains to Balloch, and it has the largest surface of any lake in Great Britain. Pick Loch Ness if your trip goes north to Inverness, Skye or the Highlands: it is deeper, holds nearly three times as much water, and has Urquhart Castle and the monster story. Loch Ness is 3 hours 40 minutes from Glasgow by road, too far for a comfortable day trip.

Loch Lomond vs Loch Ness compared

	Loch Lomond	Loch Ness
Surface area	71 km², largest in Great Britain	56 km², second in Scotland
Length	About 39 km (24 miles)	About 37 km (23 miles)
Maximum depth	About 190 m (623 ft)	About 230 m (754 ft)
Volume	About 2.6 km³	7.45 km³, largest in Scotland
Height above sea level	8 m	About 16 m
Islands	Dozens, including Inchmurrin	One, the man-made Cherry Island
Drive from Glasgow	24.5 miles, about 34 min (to Balloch)	158 miles, about 3 h 40 min (to Drumnadrochit)
Drive from Edinburgh	70 miles, about 1 h 35 min (to Balloch)	173 miles, about 3 h 50 min (to Drumnadrochit)
By train	Glasgow Queen Street to Balloch, direct	Train to Inverness (about 3 h 35 from Glasgow, 3 h 45 from Edinburgh), then a 25 to 35 min bus
Famous for	Islands, Ben Lomond, the West Highland Way, national park	Nessie, Urquhart Castle, the Caledonian Canal
Main things to do	Cruises from Balloch, Luss and Tarbet; water sports; Ben Lomond; Loch Lomond Shores	Urquhart Castle, The Loch Ness Experience, cruises, Fort Augustus locks, Falls of Foyers

Sources: NatureScot; the Loch Lomond & The Trossachs National Park fact file; Wikipedia for Loch Lomond’s volume and islands; Loch Ness Project survey for depth. Drive times by OSRM routing, free-flow; trains from ScotRail. Checked October 2026. Wikipedia gives Loch Lomond’s length as 36.4 km; the national park gives 39 km.

Size: Loch Lomond is wider, Loch Ness is deeper

On a map Loch Lomond looks bigger, and by surface it is. NatureScot puts it at 71 km², the largest of any Scottish loch, and in the whole UK only Lough Neagh and Lough Erne in Northern Ireland cover more. Loch Ness covers 56 km².

Below the surface the order flips. Loch Ness reaches about 230 m and averages 132 m. Loch Lomond reaches about 190 m, but only in its narrow northern arm; its wide southern basin rarely goes below 30 m. So Loch Ness holds about 7.45 km³ of water against Loch Lomond’s 2.6 km³, nearly three times as much. NatureScot says Loch Ness holds more water than all the lakes in England and Wales together.

Neither is the deepest. That is Loch Morar, at 310 m.

Getting there: Loch Lomond wins easily

This is the difference that decides most trips. Balloch, at the south end of Loch Lomond, is 24.5 miles from central Glasgow, about 34 minutes by car, and has its own station at the end of the North Clyde line from Glasgow Queen Street. Edinburgh to Balloch is about 70 miles, roughly an hour and a half.

Loch Ness is in the Highlands, 158 miles from Glasgow and 173 from Edinburgh. That is close to four hours each way by car, or a 3½ to 4 hour train to Inverness followed by a bus down the shore to Drumnadrochit. The Edinburgh to Loch Ness guide covers the options, including the 12.5-hour coach days from Edinburgh.

What there is to do

Loch Lomond is a national park loch with a lot of water activity. It sits inside Loch Lomond & The Trossachs, which became Scotland’s first national park in 2002. Cruises run from Balloch, Luss, Tarbet, Inversnaid and Rowardennan. People kayak, canoe, paddle board and water-ski, with speed limits in sensitive areas. The West Highland Way runs along the east bank, Ben Lomond (974 m, the most southerly Munro) rises above it, and Inchmurrin is the largest island in any body of fresh water in the British Isles. Loch Lomond Shores, near Balloch, is a visitor and shopping complex.

Loch Ness is about history and the legend. Urquhart Castle is the ruin on its rocky point 2 miles from Drumnadrochit. The Loch Ness Experience in Drumnadrochit, formerly the Loch Ness Centre, tells the monster story from the 1933 sighting onwards. Cruises leave from Drumnadrochit, Fort Augustus and two piers near Inverness. At Fort Augustus boats climb a staircase of five canal locks, and the Falls of Foyers drop 144 ft on the quieter east shore. The things to do at Loch Ness list covers the rest.

The water feels different too. Loch Ness is stained dark with peat and visibility is very low, which suits the monster story better than a swim. Loch Lomond, with its islands and shallow southern bays, is the friendlier loch to get out on.

Getting around once you are there

Both lochs work without a car, in different ways. At Loch Lomond, the West Loch Lomond Cycle Path runs 17 miles along the west bank from Arrochar and Tarbet station, near the top of the loch, to Balloch station at the bottom, so both ends of the ride have trains to Glasgow. Cruises call at Balloch, Luss, Tarbet, Inversnaid and Rowardennan.

At Loch Ness, the Citylink 919 runs down the west shore from Inverness through Drumnadrochit, Urquhart Castle, Invermoriston and Fort Augustus, about ten times a day each way on weekdays in October 2026. The east shore is harder: Highland Council’s bus 302 reaches Dores and Foyers from Inverness, but the two shores only meet at Inverness and Fort Augustus, with no bridge or ferry between. Cyclists can use the Loch Ness 360, whose six sections take about half a day each by bike.

For anglers, Loch Lomond has 15 native fish species, and the national park says it has more native and introduced species than any other loch in Scotland.

Which should you choose?

A day out from Glasgow or Edinburgh: Loch Lomond. It is under an hour from Glasgow, reachable by train, and you can spend the day on the water instead of on the motorway.

A trip that goes north anyway: Loch Ness. If your route includes Inverness, Skye or the Great Glen, Loch Ness is on the way and Loch Lomond is not. Stay a night or two in Drumnadrochit, 2 miles from Urquhart Castle, rather than passing through.

Nessie fans and castle lovers: Loch Ness. Nothing on Loch Lomond matches Urquhart Castle and the monster exhibition.

Walkers: both have a long-distance path. Loch Lomond has the West Highland Way and Ben Lomond; Loch Ness has the Great Glen Way and the 80-mile Loch Ness 360 round the loch.

Paddlers and boaters: Loch Lomond. Its islands and wide, shallow south end give you more to explore.

Families with young children: Loch Lomond for a day, Loch Ness for a holiday. A long drive eats a child’s day. If you are staying in the Highlands, Drumnadrochit has The Loch Ness Experience and Nessieland side by side.

Can you do both?

Yes, but not well in one day from Glasgow. They are about 135 miles apart by road, a little over three hours from Balloch to Drumnadrochit. The Glasgow coach tour drives past Loch Lomond and Glencoe in the morning and reaches Loch Ness at Fort Augustus, with an optional cruise, in an 11.5-hour day. It shows you both lochs but leaves little time at either, and it does not stop at Urquhart Castle.

The better plan is two stops on a Highlands road trip: Loch Lomond on the way north on the A82, a night near Glencoe or Fort William, then on up the Great Glen to Loch Ness. See Loch Ness tours for day trips, the Loch Ness guide for the loch itself, and where to stay at Loch Ness to plan the nights.