Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/4/57

तद्दिनं हि समारभ्य तत्राक्षय्यजलं सदा ।। हस्तमात्रे हि तद्गर्ते गंगा मन्दाकिनी ह्यभूत् ।। ५७ ।।

sanskrit

Thence onwards there is a perennial supply of water in that pit deep only by a hand’s length. Gaṅgā flows gently there.

english translation

taddinaM hi samArabhya tatrAkSayyajalaM sadA || hastamAtre hi tadgarte gaMgA mandAkinI hyabhUt || 57 ||

hk transliteration by Sanscript