注維摩詰經 4.210

4.210

肇曰：道場，如釋迦文佛菩提樹下初成道處，三千二百里金剛地為場。諸佛各隨國土之大小而取場地之廣狹，無定數也。

[Seng]zhao says: The place of enlightenment (bodhimaṇḍa), such as where Śākyamuni Buddha first achieved the Way beneath the bodhi tree, was an adamantine ground of 3,200 li serving as the site. The various buddhas each determine the expanse of their site according to the size of their lands, with no fixed measure.