Loch Ard is a loch, located in Loch Lomond and the Trossachs National Park, Stirling council area, Scotland. The name of the loch comes from àird, the Scottish Gaelic word for a promontory, headland, height, ultimately from àrd meaning high. The loch is approximately 4 by 2 km in size and runs east-west along a sheltered glen. It is sometimes consiā¦Loch Ard is a loch, located in Loch Lomond and the Trossachs National Park, Stirling council area, Scotland. The name of the loch comes from àird, the Scottish Gaelic word for a promontory, headland, height, ultimately from àrd meaning high. The loch is approximately 4 by 2 km in size and runs east-west along a sheltered glen. It is sometimes considered to be the source of the River Forth, although the river's true source is the confluence of its outflow, the Avondhu River, and Duchray Water. Loch Ard lies downstream of Loch Chon. The loch contains several small islands including Eilean Gorm, Briedach, St. Mallo, which is rumoured to have an old chapel dedicated to that saint, and Dundochill, which is the site of Duke Murdoch's castle that may have been built by the Duke of Albany. Though one of Scotland's smaller lochs, it is one of the most picturesque and its sheltered location means it is ideal for kayaking and other water sports.