Lembata is an island in the Lesser Sunda Islands, formerly known as Lomblen island; it is the largest island of the Solor Archipelago, in the Lesser Sunda Islands, Indonesia. It forms a separate regency of the province of Nusa Tenggara Timur. The length of the island is about 80 km from the southwest to the northeast and the width is about 30 km from the west to the east. It rises to a height of 1,533 metres.
To the west lie the other islands in the archipelago, most notably Solor and Adonara, and then the larger island of Flores. To the east is the Alor Strait, which separates this archipelago from the Alor Archipelago. To the south across the Savu Sea lies the island of Timor, while to the north the western branch of the Banda Sea separates it from Buton and the other islands of Southeast Sulawesi.