The strategic transfer of the Magadhan capital to Pataliputra was executed during the reign of Udayin. In ancient strategic literature, Pataliputra was classified as an elite example of a Jaladurga primarily because:

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Udayin realized that Rajgriha was too far south to control the newly conquered northern plain. He founded Pataliputra at the confluence of the Ganga and Son rivers, with the Gandak and Ghaghra nearby. This hydrological network transformed the metropolis into a water fortress or Jaladurga, preventing surprise cavalry or infantry attacks from rival states like Avanti.

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