Lake Eyre (/ˈɛər/ AIR), officially known as Kati Thanda–Lake Eyre, is the lowest natural point in Australia, at approximately 15 m (49 ft) below sea level (AHD), and, on the rare occasions that it fills, the largest lake in Australia and 18th largest in the world. The temporary, shallow lake is the depocenter of the vast Lake Eyre basin and is found in South Australia, some 700 km (435 mi) north of Adelaide. The lake was named in honour of Edward John Eyre, who was the first European to see it, in 1840. The lake's official name was changed in December 2012 to combine the name "Lake Eyre" with the indigenous name, Kati Thanda.