Maria Island is a mountainous island located in the Tasman Sea, off the east coast of Tasmania, Australia. The 115.5-square-kilometre (44.6 sq mi) island is contained within the Maria Island National Park, which includes a marine area of 18.78 square kilometres (7.25 sq mi) off the island's northwest coast. The island is about 20 kilometres (12 mi) in length from north to south and, at its widest, is about 13 kilometres (8.1 mi) west to east. At its closest point, Point Lesueur, the island lies approximately 4 kilometres (2.5 mi) off the east coast of Tasmania.
Tasmanians pronounce the name mə-RY-ə, as did the early British settlers but the original pronunciation was mə-REE-ə. The island was named in 1642 by Dutch explorer Abel Tasman after Maria van Diemen (née van Aelst), wife of Anthony van Diemen, the Governor-General of the Dutch East Indies in Batavia. The island was known as Maria's Isle in the early 19th century.