Valmiki Ramayana Aranya Kanda Sarga 69 Shloka 5

ततः then, परम् later, महौजसौ mighty, तौ they both, राघवौ two scions of the Raghus, जनस्थानात् from Janasthana, त्रिक्रोशम् three krosas distance (one krosa 2 miles), गम्य after going, गहनम् impassable, क्रौञ्चारण्यम् kraunchaforest, विविशतुः entered.

Both the mighty princes of the Raghu dynasty covered a distance of three krosas from Janasthana and entered the impassable kraunchaforest.