Valmiki Ramayana Kishkindha Kanda Sarga 43 Shloka 55
Original Shlokaसमतिक्रम्य तं देशमुत्तरः पयसां निधिः। तत्र सोमगिरिर्नाम मध्ये हेममयो महान्।।4.43.55।।
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तं देशम् in that place, अतिक्रम्य after crossing that place, उत्तरः northern, पयसां निधिः sea, तत्र there, मध्ये in the midst, हेममयः golden, महान् great, सोमगिरिर्नाम Somagiri,
'Cross it and, you will reach the northern sea. In its midst is the great golden mountain, Somagiri.