Srimad-Bhagavatam: Canto 4 - Chapter 1 - Verse 29


चूर्णयन् स्वधनुष्कोट्या गिरिकूटानि राजराट् ।भूमण्डलमिदं वैन्य: प्रायश्चक्रे समं विभु: ॥ २९ ॥


cūrṇayan sva-dhanuṣ-koṭyāgiri-kūṭāni rāja-rāṭbhū-maṇḍalam idaṁ vainyaḥprāyaś cakre samaṁ vibhuḥ


After this, the king of all kings, Mahārāja Pṛthu, leveled all rough places on the surface of the globe by breaking up the hills with the strength of his bow. By his grace the surface of the globe almost became flat.


Generally the mountainous and hilly portions of the earth are made flat by the striking of thunderbolts. Generally this is the business of King Indra of the heavenly planets, but King Pṛthu, an incarnation of the Supreme Personality of Godhead, did not wait for King Indra to break up the hills and mountains but did so himself by using his strong bow.