This place is about 2 km. from Rampur Bhagan. It is believed that Shri Ram, Sita ji and Laxman had taken bath in this Kund and then worshipped "Surya Dev" (Sun God). Hence it is called Surya Kund.
Valmiki Ramayana 2/46/21 to 34 Manas 218414 and arcumstantial