Buddhist Dictionary of Pali Proper Names by G P Malalasekera
Kannapennā
Kannapennā:A river in the Mahimsaka country,running out of Lake Sankhapāla.At the bend of the river and near its source was the mountain Candaka,near which the king of Magadha lived in a hut of leaves,and where he was visited by the Nāga Sankhapāla (J.v.162f).The river must have formed a lake at this bend,the lake being referred to as Kannpennā-daha (J.v.168).