Valmiki Ramayana Kishkindha Kanda Sarga 46 Shloka 18
Original Shlokaद्रुमशैलांस्ततः पश्यन्भूयो दक्षिणतोऽपराम्। पश्चिमां च दिशं प्राप्ता वालिना समभिद्रुतः।।4.46.18।।
1 source checked for this shloka
द्रुमशैलां trees and mountains, दक्षिणतः from the southern quarter, अपराम् another, पश्यन् while seeing, भूयः again, वालिना by Vali, समभिद्रुतः chased, पश्चिमां दिशम् western quarter, प्राप्ताः I reached.
'I was looking at the trees and mountains in the southern direction, I reached the western quarter pursued by Vali.