Jeannette Island (Russian: Остров Жанне́тты, Ostrov Zhannetty) is the easternmost island of the De Long Islands archipelago in the East Siberian Sea. It is the second smallest island of the De Long group, being only 2 km in length. It has an area of approximately 3.3 km² (1 sq mi). The highest peak of the island is 351 m (1,152 ft).