Isohyet is a line that connects equivalent points rainfall in a given period on a map. This map observes rainfall in Australia, the driest continent (aside from Antarctica), with an annual rainfall of less than 500 mm a year. For example, as you can see it connects Longreach to Charleville (which are two points both in the 400-500 mm range) in a contour line to illustrate exactly how much rainfall an area gets.
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