Ailinginae Atoll (
Marshallese: , ) is an uninhabited (due to
Castle Bravo nuclear testing)
coral atoll of 25
islands in the Pacific Ocean, on the northern end of the
Ralik Chain of the
Marshall Islands. Its total
land area is only , but it encloses a
lagoon of . It is located approximately west of
Rongelap Atoll. The landscape is low-lying with only the top 3 metres above sea level. The two entrances into the lagoon are 'Mogiri Pass' and 'Eniibukku Pass'. These are 0.9 and 0.3 miles wide respectively.