Várzea (English spelling) [Portugal]

Japanese: バルゼア（英語表記）várzea[ポルトガル]

Generally, it refers to low-lying land along a river or floodplains that are flooded during periods of high water. They are often used for agriculture because suspended solids carried by the river accumulate and renew the soil. The Amazon River basin in Brazil is world famous, covering an estimated area of 64,400 km2, almost twice the land area of Belgium. Agriculture that utilizes varzeas is carried out in the basins of the São Francisco and Parnaiba rivers that flow through the northeastern region of Brazil, where the Amazon receives a lot of rain but the water level changes greatly between the dry and rainy seasons and where most of the basin is semi-arid and has clearly defined dry and rainy seasons.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

一般に川沿いの低平な土地あるいは増水期には水に浸るはんらん原のこと。川が運んでくる浮遊物質が堆積し，土壌が更新されるのでよく農業に利用される。ブラジルのアマゾン川流域のものが世界的に有名で，その面積は6万4400km2もあると推定され，これはベルギーの国土面積のほぼ2倍に相当する。雨量は多いが，乾季と雨季で水位の変化が大きいアマゾン川，流域の大半が半乾燥地帯で占められ，乾季と雨季が明瞭なブラジル北東地域を流れるサン･フランシスコ川やパルナイバ川の流域では，バルゼアを利用した農業が行われている。

出典　株式会社平凡社世界大百科事典第２版について　情報

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