One Piece Chapter 51, page 3-4: Roronoa Zoro Falls Into the Sea

Zoro clenches the sword in his mouth, glaring at his opponent, and asks, "Just what're you planning to do with that?" Mihawk has pulled a tiny, cross-shaped dagger from his necklace with a sharp "SHING" sound. Mihawk explains, "I'm different from those stupid brutes who'd go all out just to hunt a mere rabbit. Though you may be a swordsman of some renown, this is East Blue, the weakest of the four seas..." A map of the world appears, showing the four seas—North Blue, West Blue, East Blue, and South Blue—separated by the Red Line and the Grand Line.

Zoro grows furious at Mihawk's blatant disrespect, gritting his teeth and saying, "To just how much you can underestimate me...! There's a limit, you better not regret it when you die!" Mihawk calmly replies, "Unfortunately, I do not have a blade smaller than this at the moment." Zoro charges forward at high speed, preparing his signature attack. Mihawk stands his ground, saying, "Hear me, little frog in his well. It's time for you to realize that the world is bigger than what it seems from your well." Zoro unleashes his strike, shouting, "ONI!!" (demon).