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
Inter-Entity Boundary Line in a way to connect Tuzla to Posavina cantons in FBiH and Pelagićevo and Donji Žabar to Lopare and Bijeljina in Republika Srpska. Inter-Entity Boundary Line The Inter-Entity Boundary Line (, ), commonly abbreviated IEBL, divides Bosnia and Herzegovina into two entities, the Republika Srpska and the Federation of Bosnia and Herzegovina. The total length of the Inter-Entity Boundary Line is . Along the IEBL is the 2 km Zone of Separation, which stretch toward both entities, making the Zone 4 km wide in total. The IEBL essentially runs along the military front lines as they were at the end