As per our ancient scriptures [granths] Braj is a manifestation of Lord Sri Radha Krishna and each and every particle of Braj is deemed worthy of great reverence. These verses from the Skand Puran delineate the holiness and significance of Braj.
Vrajstu tat sahyen shandilyasyapyanugrahaat|
Govind, gop, gopina lilasthannaynukramaat||
Govind haridevadi swarooparopen cha|
Krishnek bhaktim swe rajye tataan ch mumohdeh||
[ Skand Puran 2|4|56]
"From every respect Brajmandal is most sacred land. Lord Krishna, bare foot, has grazed cattle on this land. The entire Braj mandal is divine form of Lord Govind which is source of immense devotion and spiritualism". The glory and ecstasy of Braj lies in its range of scared hills, which are personified as incarnated form of various deities which willingly wanted to have place in Braj, in its dense green groves, divine forests and Kunds where lord krishna with His companions has performed various transcendental 'leelas'.