Revākhaṇḍa ascribed to the Vāyupurāṇa (RKV) 44.17

44.17

vakṣyāmi ca samāsena ekaikaṃ ca pṛthakpṛthak /
gayā nābhyāṃ yathā puṇyā cakratīrthaṃ ca tatsamam //

I shall describe in brief, each one separately: / As Gayā is sacred through the navel, Cakratīrtha is equal to it;