Valmiki Ramayana 6.74.61

वज्रालयं वैश्रवणालयं च सूर्यप्रभं सूर्यनिबन्धनं च।ब्रह्मासनं शङ्करकार्मुकं च ददर्श नाभिं च वसुन्धरायाः॥

vajrālayaṃ vaiśravaṇālayaṃ ca sūryaprabhaṃ sūryanibandhanaṃ ca |brahmāsanaṃ śaṅkarakārmukaṃ ca dadarśa nābhiṃ ca vasundharāyāḥ ||

Our plain-language meaning of this verse is waiting for scholar review.