Shiva Purana
सुखावतरणारोहैः स्थलैर्नीलशिलामयैः ॥ सोपानमार्गौ रुचिरैश्शोभमानाष्टदिङ्मुखम् ॥ ४ ॥
The steps that lead to it consist of blue stones and are beautiful. People can ascend and descend comfortably. Through these the lake brightens all the eight quarters.
english translation
sukhAvataraNArohaiH sthalairnIlazilAmayaiH ॥ sopAnamArgau ruciraizzobhamAnASTadiGmukham ॥ 4 ॥
hk transliteration by Sanscript