Cowroast Marina sits on the Tring summit of the Grand Union Canal in Hertfordshire, close to Cowroast Lock No. 46 and a short distance from a winding hole.

The River Bulbourne, a chalk stream, rises nearby between Cow Roast and Dudswell before flowing south-east toward Apsley.

The marina offers leisure, residential, visitor, and winter moorings, and includes a slipway, wet dock, dry dock, and fully serviced jetties. Craft with a beam greater than 3 metres cannot pass through the entrance.

The location places boaters within a few days' cruising of London and the Thames to the south and the Midlands to the north.