Endrick Water is a river located in Scotland, flowing through the Loch Lomond and The Trossachs National Park before emptying into Loch Lomond. It is characterised as a meandering river, making it suitable for intermediate paddlers rather than those seeking technical whitewater. Within the National Park's paddling offerings, the Endrick is grouped alongside rivers like the Balvaig and Forth as a more accessible option, in contrast to the more challenging rapids found on rivers such as the Falloch, Leny, and Dochart.

The river holds considerable ecological significance. Endrick Water is a designated Special Area of Conservation (SAC), centred approximately at grid reference NS506873 (latitude 56.061, longitude -4.363), covering an area of around 235 hectares. It is selected primarily for its strong and healthy populations of brook lamprey (Lampetra planeri) and river lamprey (Lampetra fluviatilis). The river lamprey population here is particularly notable because, unlike other populations that migrate to the sea, these individuals remain in freshwater as adults and feed on fish within Loch Lomond — the only recorded instance of this behaviour in the UK. Atlantic salmon are also present as a qualifying feature of the SAC designation.

Paddlers should be aware that the SAC status means the river and its surroundings are a protected habitat. Where anglers are present, maintaining a safe distance is advisable to avoid disturbance. If any section of the water forms part of a commercial fishery, speaking with the land manager before launching is recommended.

The Pesda Press guidebook "PaddleMore in Loch Lomond and the Trossachs" includes Endrick Water as a dedicated route (Route 4), with access and egress details available within that publication. The river is also listed as Route 078 in "Paddle Scotland." The put-in and take-out coordinates are not reproduced beyond the guidebook references, so consulting those publications directly is advisable for precise access point information.

Overall, Endrick Water offers a relatively gentle river paddling experience within a nationally protected landscape, making it a reasonable choice for paddlers of intermediate ability looking to explore the southern reaches of the Loch Lomond and The Trossachs National Park.