Firth of Tay
The Firth of Tay (Scottish Gaelic: Linne Tatha) is a firth in Scotland between the council areas of Fife, Perth and Kinross, the City of Dundee and Angus, into which Scotland's largest river in terms of flow, the River Tay empties. The firth has a maximum width of at Invergowrie.
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.