井の中の蛙、大海を知らず（いのなかのかわず、たいかいをしらず）

Japanese vocabulary

Meaning: the frog in the well knows nothing of the great ocean

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “井の中の蛙、大海を知らず” pronounced in real videos (YouGlish)