The churning-mountain of the devas and asuras
'Surasuranam udadhim mathnatam mandaracalam' (SB 1.3.16).
Mountain
Mandara
मन्दराचल
Mandara is the great mountain used by the devas and asuras as the churning-rod at the churning of the ocean; puranic geography counts it among the great auxiliary peaks of Meru. SB 1.3.16: it was this mountain that the Kurma avatara bore on His back.
Śrīmad Bhāgavata Mahāpurāṇa 1.3.16 — Sanskrit Wikisource (pinned oldid=369178)