Buddhist Dictionary of Pali Proper Names by G P Malalasekera
Mañjerika
Mañjerika:The name of the Nāga kingdom (Nāgabhavana).
It is five hundred leagues in extent and is the residence ofMahākāla,the Nāga king (J.i.72; J.vi.264; BuA.239).
When the urn containing the Buddha’s relics,deposited inRāmagāma,was washed away,it was taken to the Mañjerika Nāgabhavana,and remained there till taken bySonuttara to be enshrined in theMahā Thūpa.