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Knox Atoll (Marshallese: Ņadikdik, ) is an uninhabited coral atoll of 18 islands in the Pacific Ocean, and is the southernmost atoll of the Ratak Chain of the Marshall Islands. The total land area is only 0.98 square kilometers (0.38 sq mi), but it encloses a largely sand-filled lagoon with an area of 3.42 square kilometers (1.32 sq mi). The atoll measures 11 kilometers (6.8 mi) in length and is 2 kilometers (1.2 mi) wide. The largest islets, located on the western and northern sides, include Aelingeo, Nadikdik and Nariktal. The atoll is separated by the Klee Passage from the southern point of Mili Atoll to which it was once connected.
On 30 June 1905 the atoll of Nadikdik was completely washed over by a huge typhoon that stripped the atoll down to the bare coral. Almost all of the some 60 inhabitants perished, save by two boys who survived a 24-hour drift voyage clinging on a breadfruit tree. In the century since then, the islands have largely regenerated.