The Highland Boundary Fault Line runs southwest to northeast, which separates the Highlands from the Lowland. The rock to the north are hard igneous and metamorphic, whilst to the south are soft sandstone. Rivers flow and fall over these rocks , eroding the softer rock, forming a line of waterfalls. Other falls where created by glaciation during various ice ages. The scouring of the glaciers formed valleys which were filled by rivers draining off water over the steep sides these valley producing waterfalls.
Just outside Comrie, the first shock waves were recorded in 1788. This fault was highly active 400M years ago when Perthshire, like much of Britain, was a hot dry desert. Earthquake House at Comrie stands as proof that minor earth tremors can still be felt from time to time as this great fault continues to move.
The famous Deil's Cauldron and Wee Cauldron at Comrie were formed by the river Lednock cascading down from higher reaches above Glen Lednock . Both these Perthshire waterfalls are accessible with viewing platforms.
The streamlets from the surrounding mountains flow and funnel into the original bowl-shaped basin created the River Lednock, now Loch Lednock at this point, and then spilled over in magnificence in spate into the once great Perthshire waterfall called Sput Rolla.
As you leave Comrie heading east towards Crieff, there are two falls above Lawers House where the Balmenoch burn crosses the Highland Fault. Be aware of the Country Side Code as you will be crossing private property.
Before leaving the area there is another small waterfall worth a visit. Allt Na Drochaide (burn by a wooden bridge) is on the south side of Glen Artney, about 8 km from Comrie. Take the Cultybraggan road up to Glen Artney. There is parking beside the road for two or three cars. This is one Perthshires' little gems.
The next group of Perthshire waterfalls are north of the market town of Crieff. The Falls of Turret sit 3 miles (5 km) northwest of Crieff in the valley of Glen Turret. The Barvick Burn rises in hills to the east of Loch Turret and flows south eastwards to join the Turret Water 2 miles (3 km) northwest of Crieff. Near its confluence with the Turret it cascades over the Falls of Barvick. The Falls of Keltie are about 3 miles from Crieff. The Falls of Monzie are on the Shaggy Burn near Crieff.
Leave Crieff and head towards Perth. At Gilmerton take the Aberfeldy turn, continue for about 4 miles until you come to a right turning marked B8063, continue to the car park by the River Almond. Essentially, it's a natural salmon-leap on the river Almond. There's a small track that leads down to the Buchanty Spout which can be slippery and wet.
Going west on the A85 towards Lochearnhead on the north side of Loch Earn is the Falls of Beich. To access this Perthshire waterfall, drive 2 miles from Lochearnhead towards St.Fillans to where the Beich Burn flows into Loch Earn at Dalveich. The burn flows 6 miles through Glen Beich.
Continue on the A85 to Lochearnhead, at the junction with the A84 turn right up Glen Ogle towards Lix Toll. Turn right towards Killin.
On approaching Killin is the river Dochart and famous Perthshire waterfalls, aptly named Falls of Dochart.
Take the A827 road north along Loch Tay until the left turn to Ben Lawers Visitors Centre. Continue on towards Bridge of Balgie and the River Lyon until you reach the Allt Bail A Mhuilinn Burn (stream of the town of the mill) on your left. There are a number of cascades only 50m from the road approximately 3km from Bridge of Balgie.
At Bridge of Balgie turn right into Glen Lyon. Drive through one of the picturesque Glens in Perthshire. After about 4 miles look for a bridge over the river. Be careful where you park as this is a single track road. About 300m back from the bridge is an old Packhorse Bridge. The falls are just above the burn. Bridge over the Allt da Ghobwaterfall at the River Lyon in Glen Lyon. Glen Lyon is one of Scotland's beautiful glens, starting at Fortingall and runs for 20 miles to Cashlie. In the middle of the glen you will find pastures and arable land, but further up the glen turns to exposed moorland. The glen is famous for having been the home of John Cambell of Glen Lyon, responsible for the Glen Coe massacre.
Passing through the village Kenmore over the river Tay bridge take the turning to the right. You are now on the south Loch Tay road. About 1km on you will see a reconstructed Scottish Crannog few metres off the shore. Continue on for another 1km until you reach Acharn village. The Falls of Acharn are up the west side of the burn.
Retrace your steps back towards Kenmore. At the road junction take the first exit right. This is the Glen Quaich and Amulree, a steep single track road. After about 1.5km you pass Tombuie Cottage and a sharp left hand bend. There is a parking area for a couple of cars; Tombuie Waterfall is across the road beyond the larch trees.
Carefully retrace your route back to Kenmore down the steep hill. At the road junction turn right heading for Aberfeldy. Park in the town then head for the Birks of Aberfeldy. The Fall of Moness are at the top of the Birks walk.
Grandtully and Strathtay are the next villages on the A837, sitting in the heart of Highland Perthshire an area of outstanding natural beauty. The villages nestles in the foothills, either side of the Tay, joined by Grandtully Bridge, are Grandtully Rapids favoured by Scottish canoeists.
Follow the A827 until it reaches the A9. Head north to Pitlochry and take the slip road into the town. Passing under the railway arch, turn hard right along the embankment where you can park in the woodland car park. Leave the car and follow the marked route to the Black Spoutwaterfall.
Head back onto the A9 heading north. Look out for a minor road signed for 'Clunie and Foss'. Follow the road to the power station and after a few hundred meters to the car park. Walk up a stepped woodland path sign posted to the Linn of Tummel.
Return to the A9 and head north once again. Go past the turning to Blair Atholl for about 3 miles. Keep a look out for The House of Bruar on the right hand side of the road. Park in the car park and walk to the start of the Falls of Bruar.
Return to the A9 and head south. Just before you reach the turning for Dunkeld and Birnam look for the sign for The Hermitage. Park the car and follow the sign for the Ossian Hall. This is one of the most picturesque walks to a Perthshire waterfall. Go into the hall where there is a viewing point that overlooks The Falls of Braan.
Return to the A9 turn right and take the next turning for the A822 to Crieff. After about 2 miles take the minor road signed to Rumbling Bridge Falls. An old stone bridge spans the gorge high above the deep, rocky narrows and takes its name from the furious rumbling of the River Braan below. The sight is fantastic when the river is in spate, but take care as it is unfenced. There is a car park on the right just above the waterfall and the River Braan. An excellent leaflet is available from the Visit Scotland Information Centre in Dunkeld.
There are two more Perthshire waterfalls worth visiting. Drive back to the A9 cross over to Dunkeld and follow the route to Blairgowrie. Park in the picnic area at Lower Mill Street. There is a path that takes you up stream to the Falls of Ericht. Now drive to Alyth on the A923 and then 3 miles/5km north of Alyth on the B954. Reekie Linn is 200 metres below Glenisla bridge.