ATOLL

Tue, 2 Apr '24

Lagoon-forming landform

Fri, 29 Dec '23

Many a Coral Sea island

Mon, 7 Aug '23

Ring-shaped reef

Sun, 18 Jun '23

Ring-shaped reef

Fri, 19 May '23

Key ring?

Fri, 28 Apr '23

Coral arrangement

Tue, 28 Mar '23

Ring-shaped island

Mon, 9 Jan '23

Coral islet chain

Wed, 11 May '22

Island like Kiritimati

Wed, 27 Apr '22

Ring around a lagoon

Thu, 10 Mar '22

Volcanic vestige

Wed, 14 Jul '21

Bikini, e.g.