Valmiki Ramayana Sundara Kanda Sarga 44 Shloka 4

तस्य his, धनुषः bow's, महता by the huge, विष्फारघोषेण by the twang, दिशः all directions, प्रदिशश्चैव and intermediate directions, नभश्चैव heavens also, सहसा at once, समपूर्यत were filled.

All directions including the intermediate directions and the sky were filled with that loud sound produced by his twang.