Arno Atoll
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Arno Atoll is an atoll of 133 islands in the Pacific Ocean. It is a legislative district of the Marshall Islands. Its land area is only 5 mi² (13 km²), but it encloses a lagoon of 130.77 mi² (339 km²).
The population of the islands in the atoll is 2069. The most populous islands are Ajeltokrok, Kobjeltak, Rearlaplap, Langor and Tutu.
The atoll is unusual as it has two lagoons. The land joins together on the eastern side creating a separation between the two lagoons. A third lagoon could be argued however the land does not break through the water surface.