One of the famous incidents from the Ramayana is Hanuman bringing the herbal mountain containing Sanjivani herbs. His journey towards the Himalayas is described in the Yuddha Kanda Sarga 74. He sees the abodes of different Gods there. There is a shloka which says he sees Kailasa, Brahma Loka, Brahma Kapala (in Badrinath) near Himalayas etc.,
स ब्रह्मकोशं रजतालयं च |
शक्रालयं रुद्रशरप्रमोक्षम् |
हयाननं ब्रह्मशिरश्च दीप्तं |
ददर्श वैवस्वत किङ्करांश् च || ६-७४-५९
sa brahmakośaṃ rajatālayaṃ ca |
śakrālayaṃ rudraśarapramokṣam |
hayānanaṃ brahmaśiraśca dīptaṃ |
dadarśa vaivasvata kiṅkarāṃś ca || 6-74-59
He saw the abode of Brahma the lord of creation, Kailasa the abode of Shiva the lord of dissolution, the abode of Indra the lord of celestials, the arrow-discharging place of Rudra, the worshipping place of Hayagriva, the horse-faced form of Vishnu, the shining place at which Brahma's head fell down, the sun-god and Kimkaras. [6-74-59]
From the above shloka, many of the places can be identified but I could not identify what is the place where Hayagriva is worshipped.
What is the realm (loka) where Hayagriva, the Horse faced form of Vishnu is worshipped?