The sixteen Mahajanapadas of the sixth to fourth centuries BC represent the transition from tribal republics to territorial monarchies, with river systems serving as both economic lifelines and political boundaries for each polity.
Asmaka was located in the Deccan region and is consistently associated with the Godavari river valley, making it the southernmost of the Mahajanapadas. This pairing is correctly matched and reflects the agrarian base that the Godavari provided to the polity.
Kamboja was situated in the far northwest, in the region corresponding roughly to modern Afghanistan and Pakistan. It is associated with the Kabul river system, not the Vipas (Beas). The Vipas flowed through the Punjab region closer to the Madra or Trigarta territories, making this pairing incorrect.
Avanti, centred on Ujjain and Mahishmati, was watered by the Narmada and Sipra rivers, not the Mahanadi. The Mahanadi flows further east through Kalinga and Chhattisgarh territories, making this pairing incorrect.
Kosala, with its capital at Shravasti, was firmly situated in the Gangetic plain and is correctly associated with the Sarayu river. This pairing is accurately matched and is well-attested in both Buddhist and Brahmanical textual sources.
Rivers defined revenue zones, military corridors, and trade routes for Mahajanapada rulers. Accurate geographic knowledge of these polities underpins understanding of Mauryan consolidation, as Chandragupta systematically absorbed these territories by exploiting their riverine vulnerabilities.
Of the four pairs, Asmaka–Godavari and Kosala–Sarayu are correctly matched, while Kamboja–Vipas and Avanti–Mahanadi are not. Precise geographic literacy about Mahajanapadas remains foundational to understanding early Indian state formation.
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