How did the Aborigines get to Australia?

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There are a number of figures of speech used in Psalm 104 that clearly refer to the original creation as opposed to the flood. The reference to the boundaries of the deep are a clear reference to the original creation (Proverbs 8:29, Psalm 33:6-7, Jeremiah 5:22, and Job 38:8-11). There are no references to "boundaries" in any of the flood references. A second figure of speech is the idea of the earth being covered by a garment, which is only found in the creation passages, and never in the flood passages (Proverbs 30:4, Job 38:9). In addition, there are no references to the mountains rising and the valleys sinking (Psalm 104:8) after the flood, although these events could be clearly linked to the setting of the boundaries of the sea as described in Genesis 1 and Job 38.

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Hence causing what is known as the Wallace Line that divides species on one side from those on the other (except for those that could fly or swim the distance).

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Alfred Russel Wallace, the so-called father of animal geography, formulated his ideas on evolution by natural selection while observing and collecting wildlife in the islands of Southeast Asia. He was particularly impressed by the sudden difference in bird families he encountered when he sailed some twenty miles east of the island of Bali and landed on Lombok. On Bali the birds were clearly related to those of the larger islands of Java and Sumatra and mainland Malaysia. On Lombok the birds were clearly related to those of New Guinea and Australia. He marked the channel between Bali and Lombok as the divide between two great zoogeographic regions, the Oriental and Australian. In his honor this dividing line, which extends northward between Borneo and Sulawesi, is still referred to today as Wallace's Line. (See the map below.)

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You can also see this subduction zone trench formation continue along the east side of the Philippines, and another to the east that is the Mariana trench, the deepest part of ocean in the world.

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If you want a land bridge here, you are going to need to wait for a while ...

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Take a look at maps that also display sea depth; Google Earth provides that feature as well. The Persian Gulf is less than 200 feet deep, though beyond the Strait of Hormuz it starts to drop off; that means that during the Ice Age that was dry land. I suspect that the flooding of that region which must have been well populated may have formed the basis for Mesopotamian flood myths. Much of the Bering Strait and the Bering Sea is less than 200 feet deep, so that would have formed a well-known land bridge between Asia and North America. We can also see lots of land bridges extending from Southeast Asia through Indonesia and even extending up into the Philippines, though there doesn't seem to have been any land bridge providing a direct connection to Papua New Guinea, since most of the ocean floor there is thousands of feet deep.

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However, there is no land bridge connecting Asia with Australia. Separating Australia from that Southeast Asian land bridging is a trench that is thousands of feet deep. Not land-bridge material, that. Also, it looks very much like so many other trenches where one tectonic plate collides with another and the one trench starts subtending beneath the other. There is a land bridge between Australia and Papua New Guinea, but there is no land bridge connection from there to Southeast Asia, so still no land-bridge route for marsupials to take from Asia to Australia.

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can you swin 15 miles?

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