River Tay
The River Tay emerges from Loch Tay at Kenmore, and flows from there to Perth which, in historical times, was its lowest bridging point. Below Perth the river becomes tidal and enters the Firth of Tay. The largest city on the river, Dundee, lies on the north bank of the Firth. On reaching the North Sea, the River Tay has flowed from west to east across central Scotland.
River Tummel
Discharging from Loch Rannoch, it flows east to a point near the Falls of Tummel, where it bends to the southeast, a direction which it maintains until it falls into the River Tay, just below Logierait, after a course of from its source in Stob Ghabbar (). Its only considerable affluent is the Garry, long, an impetuous river which issues from Loch Garry ( and above sea level). About midway in its course the Tummel expands into Loch Tummel, between which and the confluence with the Garry occur the Pass and Falls of the Tummel, which are rather in the nature of rapids, the descent altogether amounting to . Loch Tummel was previously long and deep, but with the construction of the Clunie Dam in 1950, the water level was raised by 4.5 metres, and Loch Tummel is now approximately long.