Mahabharata 3.121.10

भवेत्संख्येयमेतद्वै यदेतत्परिकीर्तितम्न सा शक्या तु संख्यातुं दक्षिणा दक्षिणावतः

bhavetsaṃkhyeyametadvai yadetatparikīrtitamna sā śakyā tu saṃkhyātuṃ dakṣiṇā dakṣiṇāvataḥ

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