Skandapurana 16.4.20

16.4.20

dakṣiṇottarato yāvatsamudrā tkauraveśvarī ..
pūrvapaścimato yāvadgomukhāccāśvamedhikam ..
etadgarbhagṛhaṃ proktaṃ kailāsānmama vallabham .. 7.1.4.20 ..

From south to north, from the ocean as far as Kauraveśvarī; / from east to west, from Gomukha as far as Āśvamedhika: / this is declared to be the inner sanctum, dearer to me than Kailāsa.