This Śiśumāra is the pivot for the turning of the complete universe, and it is called the navel of Viṣṇu [Garbhodakaśāyī Viṣṇu]. The yogī alone goes beyond this circle of Śiśumāra and attains the planet [Maharloka] where purified saints like Bhṛgu enjoy a duration of life of 4,300,000,000 solar years. This planet is worshipable even for saints who are transcendentally situated.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तद्विश्वनाभिं त्वतिवर्त्य विष्णो- रणीयसा विरजेनात्मनैकः । नमस्कृतं ब्रह्मविदामुपैति कल्पायुषो यद्विबुधा रमन्ते
tadviśvanābhiṃ tvativartya viṣṇo- raṇīyasā virajenātmanaikaḥ | namaskṛtaṃ brahmavidāmupaiti kalpāyuṣo yadvibudhā ramante
SB 2.2.25