Map of Hill forts

Caer Alyn Hill Fort

The fort is situated on the western side of that tongue of land formed by the sharp bend in the deeply incised and well-wooded valley of the River Alyn. It has approximately the same elevation as the land which lies both to the north, and to the east across the Alyn. To the west and south of the fort, the river valley is relatively wide, and then the land starts to rise, marking the start of the Welsh foothills. If we imagine the fort with far less tree cover than it has at present, it would allow for good views of the river valley and the land immediately surrounding it. However, the fort’s lack of height relative to the surrounding countryside means it does not command a strategic view of a wider area.
We do not as yet know the full width and depth of the River Alyn in the prehistoric period, but if the river was navigable at that time, then the fort may well have been of strategic importance for monitoring traffic on the river, and may even have been used as a trading post.

Caer Drewyn

Caer Drewyn was built around 2,500 years ago. Unlike other hillforts in the area Caer Drewyn doesn't have earthen banks or ditches (ramparts), but a large dry stone wall, the remains of which can still be seen today.

Moel-y-Gaer

Moel y Gaer Llantysilio was built around 2,500 years ago in the Iron Age. It can be found between the peaks of Moel Morfydd and Moel Gamelin. The hillfort is surrounded by one bank and ditch and encloses an area of just one hectare.

http://www.heatherandhillforts.co.uk/index.php?option=com_content&view=article&id=35&Itemid=29&lang=en

Tre`r Ceiri

Said to be the most impressive hillfort in north Wales, there are significant stone ramparts surrounding its entire circuit, and in places still standing to over 3m in height.

http://www.bbc.co.uk/wales/northwest/sites/celts/pages/trer_ceiri.shtml