golokākhya gokula, mathurā, dvārāvatī
ei tina loke kṛṣṇera sahaje nitya-sthiti
goloka-ākhya - called Goloka; gokula - Gokula; mathurā - Mathurā; dvārāvatī - Dvārakā; ei tina loke - all three of these places; kṛṣṇera - of Lord Kṛṣṇa; sahaje - naturally; nitya-sthiti - eternal residence.
Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura comments that in the Goloka planet there are three divisions: Gokula, Mathurā and Dvārakā. In His incarnation as Gaurasundara, Lord Śrī Caitanya Mahāprabhu, the Lord conducts His pastimes in three areas: Navadvīpa, Jagannātha Purī (and South India) and Vraja-maṇḍala (the area of Vṛndāvana-dhāma).