CC Madhya 18.32

prātaḥ-kāle prabhu ‘mānasa-gaṅgā’ya kari’ snāna
govardhana-parikramāya karilā prayāṇa
Word for word: 
prātaḥ-kāle — in the morning; prabhu — Śrī Caitanya Mahāprabhu; mānasa-gaṅgāya — in the lake named Mānasa-gaṅgā; kari’ — performing; snāna — bathing; govardhana — Govardhana Hill; parikramāya — in circumambulating; karilā — did; prayāṇa — starting.
Translation: 
In the morning, Śrī Caitanya Mahāprabhu took His bath in a lake called Mānasa-gaṅgā. He then circumambulated Govardhana Hill.