General
On Tin Crag is a small granite buttress on the hillside overlooking Hin Fat lane and Tuen Mun Government Secondary School on the eastern side of Tuen Mun.
Access
The crag is accessed from Hin Fat Lane, by following the stairway leading up to Section 10 of the Maclehose Trail (which follows the catchwater contouring the hillside). Upon reaching the catchwater, turn left and follow this a short distance until you reach a small concrete bridge crossing the catchwater, close to distance marker M198. Follow the concrete steps up the side of the slope before continuing up a dirt trail to get yourself level with the base of the crag. A minor trail breaks off at this level to take you to the crag itself.

