An atoll is an island of coral that partially or completely surrounds a lagoon.
midway atoll is located in the northern pacific ocean
In the island of Bora Bora.
The Huvadhu Atoll is located in the Indian Ocean about 600 kilometers southwest of Colombo, Sri Lanka.
Gan International Airport (GAN) is located on the island of Gan in Addu Atoll (also known as Seenu Atoll) in the Maldives.
Kwajalein Atoll is about 2100 miles southwest of Hawaii, and 1400 miles east of Guam. It is part of the Marshall Islands.
atoll
Rarotonga
Bikini Bottom is under the Bikini Atoll is the Pacific Ocean.
bikini atoll
Probably
the oppsite of atoll is planet