Valmiki Ramayana Kishkindha Kanda Sarga 42 Shloka 1

सुग्रीवः Sugriva, तान् them, हरीन् monkeys, दक्षिणां दिशम् in the southernquarter, प्रस्थाप्य having sent, अथ now, मेघसङ्काशम् resembling a cloud, सुषेणं नाम known as Sushena, यूथपम् troop leader, अब्रवीत् said.

After sending the monkeys in the southern direction, Sugriva said to the cloudlike troop leader called Sushena. Sugriva sends the next army in the western direction -- describes rivers, mountains and places in the west.