Arno Atoll is an atoll of 103 islands in the Pacific Ocean. It is a legislative district of the Marshall Islands. Its land area is only 5 sq mi (13 km²), but it encloses a lagoon of 130.77 sq mi (339 km²).
The population of the islands in the atoll is 2069.
The country consists of 29 atolls and 5 isolated islands.
The most important atolls and islands form two groups: the Ratak Chain and the Ralik Chain (meaning "sunrise" and "sunset" chains).
Life on the outer atolls is generally still fairly traditional, and the nutrition of the rural population, being grown and caught, is superior that of most of the urban residents, who rely considerably on white rice.