Sea of Conch Shells?

So.....Friends of ours (their second visit) were just there. They love driving around the island and exploring. They told us they came across a body of water that was shallow, warm, and filled with millions of conch shells. They loved it; however, they have no idea where they were. LOL. Oyster Bay perhaps? Does anyone have a clue on this one? Would like to try to find it on our next trip later this year. TY

I think it is the area off of Rue de Coralita, outside of Quarter de Orleans. Not too far from Oyster Bay. There is also a lot of urchins there as well.