Valmiki Ramayana Bala Kanda Sarga 40 Shloka 12

तत: Subsequently, तस्मिन् when that region, खन्यमाने was being excavated, पर्वतोपमम् in size equal to mountain, महीतलम् earth, धारयन्तम् supporting, विरूपाक्षम् named Virupaksha, दिशागजम् elephant of the quarter, ददृशु: beheld.

Then while they were excavating the region they beheld the elephant of the quarter named Virupaksha equal in size to a mountain, supporting the earth.