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  它是在1881年由珍妮特號探險隊所發現,由海軍中尉喬治•華盛頓•德隆率領。1879年珍妮特號出航,希望能抵達弗蘭格爾島並探索北極周圍的北極海之開放區域。 然而,在1879年的9月,船駛進赫勒爾德島附近的浮冰區並被困住。船隻隨著浮冰飄移,經過弗蘭格爾島的北方。在1881年5月船抵達了珍妮特島和韓瑞塔島。  根據""The Annual Report of the Secretary of the Navy, for the Year 1882""一書, "A sled party landed, hoisted the national ensign, and took possession in the name of the United States. The excursion, led by George W. Melville, landed on June 2 or 3, constructed a cairn, and placed inside it a record of their visit.  During the Imperial Russian Arctic Ocean Hydrographic Expedition of 1910–1915 led by Boris Vilkitsky, the "Vaygach" approached Jeannette Island with the intention of mapping Jeannette and Henrietta Islands, but heavy ice blocked the approach. In 1916 the Russian ambassador in London issued an official notice to the effect that the Imperial government considered Henrietta, along with other Arctic islands, integral parts of the Russian Empire. This territorial claim was later maintained by the Soviet Union.  Some U.S. individuals assert American ownership of Jeannette Island, and others of the De Long group, based on the 1881 discovery. However, the United States government has not pursued De Long's claim to Jeannette Island, and recognizes it as Russian territory.
珍妮特島是俄羅斯的島嶼,位於東西伯利亞海,屬於德朗群島的一部分,由薩哈共和國負責管轄,長2公里,面積3.3平方公里,最高點海拔高度107米。珍妮特島是由美國的北極探險隊珍妮特號成員所發現。