佛頂尊勝陀羅尼經教跡義記 2.161

2.161

述曰：第七舉後證果。言菩提道場者，即摩竭提國寂滅道場。《俱舍論》云：「於此洲中有金剛座，上窮地際下據金輪，一切菩薩皆於此座起金剛定。」

The commentary says: Seventh, citing the final realization of the fruit. As for 'the place of the bodhimaṇḍa', it is the site of tranquil extinction in the country of Magadha. The Abhidharmakośa-śāstra says: 'In this continent there is a vajrāsana; above it reaches the limit of the earth, below it rests on the golden wheel. All bodhisattvas attain the vajra-samādhi on this seat.'