Loch Éireann (Loch Earn)

Loch Earn is approximately 10.5 km long, 1.2 km at its widest point and approximately 87 m at its deepest point.

Lochearnhead is situated at the western end of the loch and is a centre for water sports including water skiing, canoeing, and sailing. The loch is stocked regularly with brown and rainbow trout and fishing, by permit, is possible both from the shore and by boat. The village of St. Fillans nestles at the eastern end and from here the River Earn flows eastwards from the loch through Strathearn, eventually joining the Firth of Tay 75 km away.

To the south of the loch lies the 985m high Ben Vorlich, a popular climb.

East of Lochearnhead, on the south side of the loch, is Edinample Castle, built by 'Black' Duncan Campbell of Glenorchy in 1584. Further east is Ardvorlich House, home to the Stewarts of Ardvorlich from 1580.

Loch Earn has its own 'tidal system' (seiche) caused by the action of the prevailing wind blowing along the loch. This wind pressure on the surface causes the water level to build up at one end of the loch and results in oscillation causing the water to return to the opposite end of the loch over a period of 16 hours. Other bodies of fresh water which experience this seiche effect include Lake Geneva, Lake Garda, Lake Erie and Lake Baikal.