Tanyabi, a pretty damsel, lived in Chakma village on the bank of rivulet Chengi. She was deeply in love with a poor young man, Punang chan. But, her parents get her married to a rich old man in a distant village. The river Chengi, was so grief-stricken, that it changed its course by nearly one kilometre and the old dried up course was gradually filled up the grieving Tanyabi’s tears and thus a lake was formed, where she drowned herself to death. The Chakmas sing of it as a folk tale even today.