Loch Tay (Scottish Gaelic, Loch Tatha) is a freshwater loch in the central highlands of Scotland, in the district of Perthshire.
It is a long narrow loch of around 14 miles (23 km) long, and typically around 1 to 1 1/2 miles wide, following the line of the valley from the south west to north east. It is the sixth largest loch in Scotland by area and over 150 m deep at its deepest.
Ben Lawers on its north shore is at 1214 m the 10th highest mountain in the British Isles, and is the highest peak in a group of seven munros.