Geo Mon

This website is an expanding guide to the geology of Anglesey (Ynys Môn), for visitors, students, teachers and researchers. The Isle of Anglesey is the largest of the Welsh islands, situated in the north west corner of Wales. The island covers an area of some 720 square kilometres and it has 201 kilometres of coastline. Follow the links on the website to begin your virtual tour of the island and its fascinating, complex and sometimes controversial rocks!

Venue Type:

Association or society, Garden, parklands or rural site

Opening hours

Geo Mon is an island, and is open 24/7

Admission charges


Resources listed here may include websites, bookable tours and workshops, books, loan boxes and more. You may need to scroll down or click on headers to see them all.

Anglesey Young Geologists' Cub

Join the Young Geologists and take part in geological adventures around Anglesey, such as Dinosaur Dioramas and Field events. Events take place once every two months at 14.00-16.00.

How to obtain

Have a look at the website for a calendar of events. Also, contact Margaret Wood on 01248 810287 for more information.

Geo Mon
Anglesey Geodiversity Project
Menai Bridge
LL59 5SN



General enquiries


General enquiries

01248 810287

All information is drawn from or provided by the venues themselves and every effort is made to ensure it is correct. Please remember to double check opening hours with the venue concerned before making a special visit.