@JoyfulSilence if it relates to Worms Head you can walk to the Head of the Worm but must return before high tide unless you want to spend the night there 😀
I was at a place in Maine with a little island you could walk to at low tide. I did. But I came back shortly after since I was not sure when the tide would come back in. They had no sign.
@JoyfulSilence It's pretty dangerous if you get stuck on the crossing. One of my friends is RNLI crew down there and it's to try and stop them having to be called out to rescue people so often