Loch Long is a major sea loch in Argyll and Bute, extending approximately 30 kilometers from the Firth of Clyde northeast to the foot of the Arrochar Alps. It is a tidal saltwater feature, approximately 2 to 3 kilometers wide, and forms part of the eastern shore section of the long-distance Argyll Sea Kayak Trail. The loch offers a dramatic paddling environment with the mountainous backdrop of the Southern Highlands, specifically within Loch Lomond and The Trossachs National Park. Key launch and take-out points include the village of Ardentinny on the western shore, which features a slipway on the foreshore providing direct access to the tidal waters. The area around Arrochar at the head of the loch also provides parking and access. As a sea loch, paddling is subject to tidal currents and wind exposure, particularly given its length and orientation which can create significant fetch. The loch is also a navigable channel for boat traffic, including yachts, which must be considered when planning crossings or paddling along the main axis. The Argyll Sea Kayak Trail route passes along the eastern shore, indicating this is a viable multi-day paddling route requiring intermediate skills, tidal planning, and self-sufficiency, with wild camping likely available along the shores. The scenery is stunning, with the loch acting as a recurrent scenic backdrop for the nearby Three Lochs Way walking route. The best season for paddling is generally from May to September, with June offering the longest days. As a Scottish sea loch, water temperatures will be cold year-round, necessitating appropriate immersion gear.