Lake Argyll (Ord River Dam) on the Ord River is the second largest man made lake in Australia. At full capacity, it holds 35 million megalitres of water and covers a surface area of 2,072 square kilometres.
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On the map at http://365project.org/terryliv/from-the-archiv/2015-01-06 this is shown as Day 10 and it should be Day 11.