Wallace Line by the Sahul Shelf to New Guinea. The biogeographic boundary known as Lydekker's Line, which separates the eastern edge of Wallacea from the Australian region, has a similar origin to the Wallace line. During ice age glacial advances, when the , both Asia and Australia were united with what are now islands on their respective continental shelves as continuous land masses, but the deep water between those two large continental shelf areas was, for over 50 million years, a barrier that kept the flora and fauna of Australia separated from those of Asia. Wallacea consists of islands that were not
Bali over Bali began in the 1840s on the island's north coast, when the Dutch pitted various competing Balinese realms against each other. In the late 1890s, struggles between Balinese kingdoms in the island's south were exploited by the Dutch to increase their control. In June 1860, the famous Welsh naturalist, Alfred Russel Wallace, travelled to Bali from Singapore, landing at Buleleng on the north coast of the island. Wallace's trip to Bali was instrumental in helping him devise his Wallace Line theory. The Wallace Line is a faunal boundary that runs through the strait between Bali and Lombok. It has