SB 11.16.20

tīrthānāṁ srotasāṁ gaṅgā
 samudraḥ sarasām aham
āyudhānāṁ dhanur ahaṁ
 tripura-ghno dhanuṣmatām
Synonyms: 
tirthānām — among holy places; srotasām — among flowing things; gaṅgā — the sacred Ganges; samudraḥ — the ocean; sarasām — among steady bodies of water; aham — I am; āyudhānām — among weapons; dhanuḥ — the bow; aham — I am; tri-pura-ghnaḥ — Lord Śiva; dhanuḥ-matām — among those who wield the bow.
Translation: 
Among sacred and flowing things I am the holy Ganges, and among steady bodies of water I am the ocean. Among weapons I am the bow, and of the wielders of weapons I am Lord Śiva.
Purport: 

Lord Śiva used his bow to completely cover with arrows the three demoniac cities built by Maya Dānava.