It is understood that this philosophy (Bhagavad Gita) evolved on the Battlefield of Kurukñetra, which is a sacred place of pilgrimage from the immemorial time of the Vedic age.
The word dharma-kshetra (a place where religious rituals are performed) is
significant because, on the Battlefield of Kurukñetra, the Supreme Personality of Godhead was present on the side of Arjuna.
As in the paddy field the unnecessary plants are taken out, so it is expected from the very beginning of these topics that in the religious field of Kurukñetra where the father of religion, Çré Kåñëa, was present, the unwanted plants like Dhåtaräñöra’s son Duryodhana and others would be wiped out and the thoroughly religious persons, headed by Yudhiñöhira, would be established by the Lord. This is the significance of the words dharma-kñetre and kuru-kñetre, apart from their historical and Vedic importance.
BG 1.1 Purpot