Valmiki Ramayana Kishkindha Kanda Sarga 46 Shloka 1

वानरेन्द्रेषु when the monkey chieftains, गतेषु had gone, रामः Rama, सुग्रीवम् to Sugriva, अब्रवीत् said, भवान् you, भुवः of the earth, सर्वम् entire, मण्डलम् region, कथम् how, विजानीते do you know

When the chieftains of the monkeys left, Rama enquired Sugriva, how he had come to know the regions of the entire earth (which is a mandala. a circular form). Sugriva narrates the fight between Dundubhi and Vali and explains how he has come to acquire knowledge of geogrphy of all quarters