This is probably an opening at the top of a cave that is open to the surf below. When a wave of the right size comes into the cave, the force of the wave gets concentrated by the walls of the cave and the water ends up blowing up through the hole.
Quite right and a concise explanation, thank you Ken.
Li, I suppose my title isn't exactly accurate as some of the ejected water does get into this recess via a narrow open gully and is forced up and out. But I've listened long and hard and I swear that there is ALSO a blowhole here as Ken describes - you CAN hear the water below rushing to the back of a cave and being forced up and out through a roof cavity some seconds after a wave has crashed onto the foreshore. I feel that the two need not be mutually exclusive. I have posted true blowhole photos elsewhere on this site.
Thanks to you both.
Best wishes, Andy
Very nice photo.Like.Greetings,Mirjana
Many thanks, Mirjana. Best wishes, Andy
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Photo taken in Zennor, Cornwall, UK
Misplaced? Suggest new location