Unlike most other atolls, Arno encloses three different lagoons, a large central one, and two smaller ones in the north and east.

Arno women are renowned for their production of the Kili Bag, a popular handwoven handbag/purse, named after another island in the Marshall Islands (to which the people of Bikini were eventually relocated as a result of the US nuclear tests that were conducted on their home atoll).

Arno Atoll was claimed by the German Empire along with the rest of the Marshall Islands in 1885.

[3] After World War I, the island came under the South Seas Mandate of the Empire of Japan.

Following the end of World War II, Arno Atoll came under the control of the United States as part of the Trust Territory of the Pacific Islands.