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Manihiki is one of the larger islands, 10.5 km (6.5 mi) long, in the remote Cook Island chain. With its fringing coral reef and central lagoon, it has the hallmarks of a classic atoll. Most of the main atoll is made up of sandy beaches without vegetation. Two small towns -- Tauhunu and Tukao -- appear as clusters of small bright patches in the forest.  Image courtesy of NASA.
Rarotonga is the largest and most populous of the Cook Islands. Image courtesy of NASA.
Mangaia is the most southerly of the Cook Islands and the second largest after Rarotonga Island. Image courtesy of NASA.
A large cloud bank moves in on Aitutaki Atoll in the Southern Cook Islands. Image courtesy of NASA.
Aitutaki in the Southern Cook Islands has a distinctive equilateral triangular shape that is roughly 12 km (7.5 mi) on each side. It is an "almost atoll" whose coral reef barrier does not extend above the ocean along its southern side. Image courtesy of NASA.
A close up view of Aitutaki in the Cook Islands. The island's airport may be seen on the northern point (upper right). Image courtesy of NASA.