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Lake Tritriva is a is small lake which fills an extinct crater 17 kilometres west of [[Antsirabe]], past [[Andraikiba|Lake Andraikiba]]. The name originates from the Malagasy words 'tritry', meaning the ridge back of a chameleon, and 'iva' meaning deep. The lake is said to be some 80 metres deep.

The water level drops in the rainy season and rises in the dry season and debris from the lake can found down in a valley below, supporting a theory of existing underground channels.