taんぼnbo
1.

A cultivated area of land typically flooded with water, used specifically for the growing of rice and other aquatic plants.

2.

A flat, enclosed section of farmland where crops, particularly rice, are intentionally planted and nurtured, often relying on water management techniques.

3.

A historical term referring to rice fields in the Edo period, particularly in the vicinity of the New Yoshiwara area, indicating the cultural significance of these agricultural landscapes.

Example:

この辺りは昔、田んぼだったんだよ。