Analysis of information sources in references of the Wikipedia article "Patna" in English language version.
... the greatest city in India is that which is called Palimbothra, in the dominions of the Prasians, where the streams of the Erannoboas and the Ganga unite,—the Ganga being the greatest of all rivers. The Erannoboas are perhaps the third largest of Indian rivers, though greater than the greatest rivers elsewhere. Still, it is smaller than the Ganga, where it falls into it. Megasthenes informs us that this city stretched in the inhabited quarters to an extreme length on each side of eighty stadia, and that its breadth was fifteen stadia, and that a ditch encompassed it all round, which was six hundred feet in breadth and thirty cubits in depth, and that the wall was crowned with 570 towers and had four-and-sixty gates....
{{cite web}}: |author= has generic name (help)... the greatest city in India is that which is called Palimbothra, in the dominions of the Prasians, where the streams of the Erannoboas and the Ganga unite,—the Ganga being the greatest of all rivers. The Erannoboas are perhaps the third largest of Indian rivers, though greater than the greatest rivers elsewhere. Still, it is smaller than the Ganga, where it falls into it. Megasthenes informs us that this city stretched in the inhabited quarters to an extreme length on each side of eighty stadia, and that its breadth was fifteen stadia, and that a ditch encompassed it all round, which was six hundred feet in breadth and thirty cubits in depth, and that the wall was crowned with 570 towers and had four-and-sixty gates....
{{cite web}}: |author= has generic name (help)