I think the source of the water might vary depending on how deep was the well. There are layers of water separated by layers of rock down there. The water from 150 metres down might have a different source from the water 1500 metres down.
The shallower water might have a local source while the deeper water might have a more distant source.
The whole continent is floating, you know.
Not sure about PNG, but when we were at Lawn Hill Gorge we were told the water there came from the north-west of the country. BTW the water level in the gorge is currently down almost 2 metres compared with the normal level, which is a lot.
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