Valmiki Ramayana Kishkindha Kanda Sarga 40 Shloka 1

प्लवगेश्वरः lord of monkeys, राजा king, सुग्रीवः Sugriva, समृद्धार्थः supported by massive army, अथ then, नरशार्दूलम् tiger among men, परबलार्दनम् who could crush enemy army, रामम् to Rama, उवाच said.

Sugriva, lord of monkeys, who was supported by a massive army informed Rama, the tiger among men and a crusher of the enemy army Sugriva asks the army to move eastward -- description of eastern direction.