It's an idyllic, hidden gem in Gower which attracts many to swim within its waters.
Blue Pool, near Broughton Bay, has been measured at between four and eight metres deep, depending on tidal and weather conditions, making it popular with people who like to dive in.
But weather conditions created by stormy seas have meant it's currently nowhere near as deep.
Rhossili Coastguard has issued a warning that it is currently three quarters filled with sand, and only three to four feet deep.
And it has stressed the dangers of diving into the pool, stressing how people will hit the bottom if they attempt it.
A warning on its Facebook page read: "We would like to warn people that travel to blue pool in Broughton.
"For people who don’t know, it’s an amazing large natural pool in the side of a cliff. People can swim in it and also people jump off the cliff into it as it is usually very deep.
"Warning. Blue pool is three quarters filled with sand and only three to four foot deep.
"Do not jump in, you will hit the bottom. Please let people that go there know."
What life is like in Gower...
The pool continues to attract many to the area, and just two days ago, on Wednesday, July 24, at 10.30pm, the coastguard was tasked to Broughton car park after four girls got lost between Llangennith and Broughton after they went looking for the water feature and got lost.
The area is very open and in some areas very remote. The girls were eventually discovered in part of the sand dunes.
A spokesman for Rhossili coastguard added: "It's an amazing place, a natural pool, but it's three quarters filled with sand at the moment.
"People used to go and swim there but you do get people jumping off the side, and a little lad broke his ankle there last year.
"The tide can bring it in and bring it out and it has just been filled up through the tide and stormy seas.
"You just don't know, in a couple of months it could empty it, the sand comes in and out, but it has made it more dangerous at the moment."
