A 1,500 meter swim is often called a 'mile' swim. Here in the US, most pools are 25 yards, and college swim meets feature a 1,650 yard race which is often also called 'the mile'. I think since since a meter is about 10% longer than a yard, someone just took 1500 meters and added 10% to get 1,650 yards. So I've seen the 1650 called a 'mile swim', but never a 1600.
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