Bikini Atoll is an atoll in the Marshall Islands which consists of 23 islands totalling 3.4 square miles surrounding a 229.4-square-mile central lagoon. It is at the northern end of the Ralik Chain, approximately 87 kilometres northwest of Ailinginae Atoll and 850 kilometres northwest of Majuro. Within Bikini Atoll, Bikini, Eneu, Namu and Enidrik islands comprise just over 70% of the land area. Bikini and Eneu are the only islands of the atoll that hosted a permanent population. Bikini Island is the northeastern most and largest islet. Before World War II, the atoll was known by its German name, Eschscholtz Atoll.
The atoll is known for the nuclear testing the United States conducted on it during the 1940s and 1950s, in which the indigenous population were removed.