Srila Bhaktisiddhanta Sarasvati Prabhupada Maharaja had published a book of scholarly verses known as Gaura Krishnodoya compiled by the famous Oriyan vaisnava poet, Srila Govinda Das. This book was earlier received by His Divine Grace in the form of a palm leaf manuscript presented by a person named Mr. Mohanty who was at that time the Manager of Sri Jagannath temple, Puri.
The language of the book named Gaura Krishno Daya was extremely scholarly in its expression, and it revealed the greatest unparalleled wisdom concerning the glories of Lord Caitanya.
lingam drustai kamravanastham bhuvanesam
bhargavyantargupta kapatesvara desam
gatva dandam bhratari datva prabhuragat
prasada syaloka namatrat dhuriragat
bhankta dandam tairatha bhakteira vadhutah
paschatdhavan tatparicarya pariputah
(Sri Gaura Krishnodoya, 8th sarga, text-2 & 3)
This above verse was published by His Divine Grace Srila Bhaktisiddhanta Sarasvati Prabhupada, in the book named Gaura Krishna Doya.
The verse clearly mentions that the Dandabhanga pastime had taken place on the bank of the river Barghavi, located in the state of Kapatesvara.His Divine Grace Srila Bhaktisiddhanta Sarasvati Prabhupada, in his Amrta Prabhava Bhasya(Bengali commentary on Sri Caitanya-caritamrta), of the Madhya-CH-5, 143rd verse, had also very nicely explained about the mystery behind the breaking of the sannyasi staff.
Later in his Gaudiya Bhasya (Bengali commentary on Sri Caitanya-bhagavatam), he gives a purport over the 237th verse of the Antya Khanda, 2nd Chapter. There, he expresses his suspicion about the mentioning of the Dandabhanga Pastime taking place on the bank of river Suvarna Rekha.
[Note: Actually the book named Amrta Prabhava Bhasya is the original commentary given by Srila Bhaktivinoda Thakur over Sri Caitanya-caritamrta. Later Srila Bhaktisiddhanta Sarasvati Thakur gave his own commentary over the Amrta Prabhava Bhasya of Srila Bhaktivinoda Thakur. This was called the Anubhasya. However, this Anubhasya by Srila Bhaktisiddhanta Sarasvati Thakur is also commonly called as the Amrta Prabhava Bhasya.]