Question

the mace fighting (gada yuddha) between bhimasena and duryodhana took place at a place called

Answer 1

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

Answer 2

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.