A paddy field — a flooded field used for growing rice. Colloquially 'tanbo', formally 'suiden' (paddy field).
春になると田んぼに水が入り、田植えの準備が始まる。
In spring the paddy fields are flooded and preparations for rice planting begin.
子どものころ、祖父と田んぼで遊んだ思い出がある。
When I was a child, I have memories of playing in the paddy fields with my grandfather.
その村の田んぼは夏になると一面の緑になる。
The village's paddy fields turn into a sea of green in summer.