If you want to know where the gada yudh between bheem and duryodhan took  place, then your answer is Kurukshetra.

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After the death of Karna, Duryodhana left battle field of KuruKshetra and went in North East direction.   He found a deep lake called "Dwaipayana".  He hid himself inside that using the technique of Jalastambhana.

Bhima and Duryodhana fought with maces (gada) beside the lake, some distance from Kurukshetra.