Shiva Purana
तस्यापि मेरुः कालेयमध्ये कनकपर्वतः ॥ प्रविष्टः षोडशाधस्ताद्योजनैस्तस्य चोच्छ्रयः ॥ ४॥
In the middle of that also is the golden mountain Meru It entered sixteen yojanas below the ground and its height.
english translation
tasyApi meruH kAleyamadhye kanakaparvataH ॥ praviSTaH SoDazAdhastAdyojanaistasya cocchrayaH ॥ 4॥
hk transliteration by Sanscript