Shiva Purana
क्षीरोदेनावृतस्सोऽपि द्विगुणेन समंततः ॥ क्षीराब्धिस्सर्वतो व्यास पुष्कराख्येन संवृतः ॥ ५९ ॥
It is also covered by the ocean of milk on all sides twice as much The ocean of milk is surrounded on all sides by a lake called Pushkara.
english translation
kSIrodenAvRtasso'pi dviguNena samaMtataH ॥ kSIrAbdhissarvato vyAsa puSkarAkhyena saMvRtaH ॥ 59 ॥
hk transliteration by Sanscript