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Dinas Dinlle
Dinas Dinlle - - 38168.jpg
Dinas Dinlle
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OS grid reference SH435568
  • Llandwrog
Principal area
Country Wales
Sovereign state United Kingdom
Postcode district LL54
Dialling code 01286
Police North Wales
Fire North Wales
Ambulance Welsh
EU Parliament Wales
UK Parliament
  • Arfon
Welsh Assembly
  • Arfon
List of places
53°05′10″N 4°20′10″W / 53.086°N 4.336°W / 53.086; -4.336
Dinas Dinlle
General information
Architectural style Iron Age hillfort
Country Wales
Coordinates 53°05′10″N 4°20′11″W / 53.086034°N 4.336252°W / 53.086034; -4.336252
Technical details
Size 150 m x 110m

Dinas Dinlle is a small settlement in Gwynedd, north-west Wales which is also, historically, part of Caernarfonshire.


Dinas Dinlle has a large sand and pebble beach with vast areas of sand from mid-tide level. The foreshore consists of natural pebble banks. The popular beach offers views towards the Llŷn Peninsula (Penrhyn Llŷn) and towards Ynys Llanddwyn (Llanddwyn Island) on Anglesey. The area is a designated Site of Special Scientific Interest (SSSI). According to the 2011 Census, 77.9% of the population were Welsh speakers.

A small airport, Caernarfon Airport, is nearby. During the Second World War this was an RAF base but now it is mainly used for flying lessons and pleasure flights. A caravan park is located nearby.

The erosion by the sea is a substantial problem. A groyne built in 1994 to alleviate the problem was thought to be a mistake that had made the situation worse by 2013. The height of the groyne was to be reduced and the large boulders removed. This was important to preserve the beach and the Wales Coast Path.


The cliff above the beach is known as Boncan Dinas and is occupied by an Iron Age hillfort, Dinas Dinlle. This fort has been eroded by the sea, such that only a double semi-circular rampart remains. Finds of Roman pottery suggest reoccupation in the 2nd or 3rd centuries CE. The fort is about 164 yards from north to south by 120 yards with an entrance on the south west. It is possible that a Roman lighthouse originally stood here. It is possible to make out small depressions which are thought to indicate the sites of Iron Age huts and the mound may be the remains of a barrow.

Archaeological excavations at Dinas Dinlle in 2019 found the remains of structures inside the hillfort. These included 13m-diameter stone-built roundhouse with walls over 2m thick, thought to be one of the largest ever found in Wales. The excavations also found Roman coins and pottery dating from around 200CE to 300CE. The archaeological work was undertaken by the Gwynedd Archaeological Trust and the RCAHMW with funding from the EU 'CHERISH' project.


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