The Marshall Islands are a group of islands and atolls in the Pacific Ocean, located between Hawaii and Australia. They were previously known as the "Bikini Islands," due to the famous nuclear weapons testing that occurred there in the mid-20th century. Some synonyms for the Marshall Islands include the "Ratak Chain" and the "Ratak Atoll" group. These names come from the Marshallese words for "sunrise" and "sunset," respectively, due to the location of the islands along the Earth's meridian. Other synonyms include "Majol," a term that refers to the Marshall Islanders themselves, as well as "Republic of the Marshall Islands," the official name of the island nation.