Mackay Lacus is the seventh largest of a number of hydrocarbon seas and lakes found on Saturn's largest moon, Titan.

The lake is composed of liquid methane and ethane,[1] and was detected by the Cassini space probe.

Mackay Lacus is located at the coordinates 78.32°N and 97.53°W on Titan's globe and is 180 km in length.

[2][note 1] It is named after Lake Mackay in Western Australia.

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