When Lord Caitanya went to Vṛndāvana , He discovered Rādhā-kuṇḍa and Śyāma-kuṇḍa. It was just shallow water in two fields, and many people were wondering why this sannyāsī is bathing in the field. But He revealed that actually this was Rādhā-kuṇḍa and that was Śyāma-kuṇḍa. And then He requested Śrīla Rūpa and Sanātana Gosvāmī and the others of six Gosvāmīs to research and discover all the hidden holy places.

The Sacred Glories of Radha Kunda

The holy city of Mathura holds a position of spiritual supremacy over Vaikuntha, the transcendental world, because it is where the Supreme Lord appeared. Yet, even greater than Mathura is the transcendental forest of Vrindavana, renowned for the divine rasalila pastimes of Lord Krishna. Superior to Vrindavana is Govardhana Hill, uplifted by Krishna’s divine hand and the site of His many loving pastimes. But above all, the superexcellent Radha Kunda reigns supreme, overflowing with the ambrosial nectar of love for Sri Krishna, the Lord of Gokula. Who then, with intelligence, would hesitate to serve the sacred Radha Kunda, nestled at the foot of Govardhana Hill?

— From Srila Rupa Goswami’s Nectar of Instruction (Upadeshamritam)