CC Madhya 19.78

yamunāra jala dekhi’ cikkaṇa śyāmala
premāveśe mahāprabhu ha-ilā vihvala
Word for word: 
yamunāra — of the river Yamunā; jala — the water; dekhi’ — seeing; cikkaṇa — glossy; śyāmala — blackish; prema-āveśe — in ecstatic love; mahāprabhu — Śrī Caitanya Mahāprabhu; ha-ilā — became; vihvala — bewildered.
Translation: 
While crossing the river Yamunā, Śrī Caitanya Mahāprabhu saw the glossy black water and was immediately bewildered with ecstatic love.