From the Britannia Bridge, take the A5025 through Benllech. Turn left at the small roundabout near Moelfre towards Amlwch.
Go through Brynrefail, and City Dulas. After the garage and boatyard at Dulas take the first left, signposted Pengraigwen. Follow the lane for one mile, keeping left at the fork, signposted Penygraigwen.
Turn left towards Llannerchymedd.
The gate for Deri Fawr is on your left, 300 yards from the crossroads.