Shiva Purana
वारिमंडलमध्यस्थं महादेवार्चने रतम् ॥ तुरीयं शिवबीजेषु त्रयोदशकलान्वितम् ॥ ३७ ॥
It is situated in the middle of the ocean and is engaged in the worship of Lord Śiva. The fourth is composed of thirteen arts in the seeds of Lord Shiva.
english translation
vArimaMDalamadhyasthaM mahAdevArcane ratam ॥ turIyaM zivabIjeSu trayodazakalAnvitam ॥ 37 ॥
hk transliteration by Sanscript