Mahabharata 3.193.15

समुद्रो वालुकापूर्ण उज्जानक इति स्मृतःबहुयोजनविस्तीर्णो बहुयोजनमायतः

samudro vālukāpūrṇa ujjānaka iti smṛtaḥbahuyojanavistīrṇo bahuyojanamāyataḥ

Our plain-language meaning of this verse is waiting for scholar review.