Mil Tracta (original Sapkowski's Elder Speech name: Mil Trachta), formerly known as Centloch, is a lake-dotted region in northern Metinna near the Amell Mountains. Tarn Mira is one of the many lakes and the legendary Tor Zireael rises from that lake.
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'The land of a Hundred Lakes, once called Centloch,' Vysogota explained, 'is called Mil Tracta today. It's a very vast lake land bisected by the River Yelena in the northern part of Metinna, close to the border with Nazair and Mag Turga.
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— pg(s). 334, The Tower of the Swallow (UK edition)