Up on the northwest corner of Holy Island, up on the northwest corner of Anglesey and some amazing scenery, and some of the fastest tide races in the country as huge volumes of seawater sweep up round Wales and into the Irish sea.
Two big headlands dominate the coast - and this is looking down on South Stack.
A bit up the coast, and looking down on the north side of South Stack, with its two caves -
There is a high level path that heads further up the coast, and eventually you can look down on the other big headland - North Stack - with several more caves.
Down the coast from South Stack a much lower headland sticks out into the tidal current, and the flood tidal current flowing through the various outlying rocks produces the famous tidal races of Penrhyn Mawr - here is a general sort of view - the outer race is in classic form.
Another view from along a bit, and on the left is the inner race -
Closer in and there are a number of smaller races that at some tide levels flow into a sort of lagoon - however don`t under-estimate the current flowing through the lagoon.
Closest into the rocks of the coast there is a narrow channel which at some tide levels can provide a useful chicken run - but watch out for the swell coming through it.
Across the bay from Penrhyn Mawr there is an amazing stack called Dinas Stack that has some of the most striking examples of folded rocks - which you can`t see from the land, you need to get out in a boat to see them.
There can be surprisingly strong currents around Dinas Stack, and if they meet a swell - look out !