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The River Tummel is a 58 mile long tributary of the River Tay in Perth and Kinross. It rises in Loch Rannoch.
Wikipedia: Link

Linn of Tummel is a 19 hectare woodland property at the confluence of the rivers Garry and Tummel, near Pitlochry. It is owned and maintained by the National Trust for Scotland.
The name Linn of Tummel comes from the Scots Gaelic and means "pool of tumbling stream". The name comes from the fact that the River Tummel used to drop down over a fall to meet the River Garry; however, in 1950 the fall ceased when a new hydro-electric plant raised the level of both rivers and created Loch Faskally. Only the top of the falls is now visible.
The property includes an obelisk commemorating the visit of Queen Victoria in 1844.
The National Trust for Scotland have owned the Linn since 1944, when it was given to them by Dr George Freeland Barbour of Bonskeid.

The National Trust for Scotland (Scottish Gaelic: Urras Nàiseanta na h-Alba), is a Scottish conservation organisation. It is the largest membership organisation in Scotland and describes itself as "the conservation charity that protects and promotes Scotland's natural and cultural heritage for present and future generations to enjoy".
The Trust owns and manages around 130 properties and 180,000 acres of land, including castles, ancient small dwellings, historic sites, gardens, and remote rural areas. It is similar in function to the National Trust, which covers England, Wales, and Northern Ireland, and to other national trusts worldwide.
Wikipedia: Link
List of all the properties: Link