This is the 13772nd most frequent Russian word.
низину
A lowland or a depression in the landscape.
In this sentence, 'низину' refers to a geographical lowland or depression in the terrain.
Мы спустились в низину, чтобы увидеть реку.
We descended into the lowland to see the river.
Here, 'низину' describes a low-lying area where water tends to accumulate due to its geographic position.
В низине всегда собираются дождевые воды.
Rainwater always gathers in the lowland.
In this context, 'низина' denotes a small area lower than its surroundings, indicative of a landscape feature.