Mahabharata 6.10.36
तथा नद्यस्त्वप्रकाशाः शतशोऽथ सहस्रशःइत्येताः सरितो राजन्समाख्याता यथास्मृति
tathā nadyastvaprakāśāḥ śataśo'tha sahasraśaḥityetāḥ sarito rājansamākhyātā yathāsmṛti
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book