CC Antya 20.126

pañcadaśa-paricchede — udyāna-vilāse
vṛndāvana-bhrame yāhāṅ karilā praveśe
Word for word: 
pañcadaśa-paricchede — in the fifteenth chapter; udyāna-vilāse — in His pastimes within the garden; vṛndāvana-bhrame — His mistaking the garden for Vṛndāvana; yāhāṅ — where; karilā praveśe — He entered.
Translation: 
In the fifteenth chapter is a description of how Śrī Caitanya Mahāprabhu entered a garden on the seashore and mistook it for Vṛndāvana.