This is the 1807th most frequent Russian word.
лесу
The Russian word "лесу" means "forest" or "woods" in the prepositional or dative case.
Here, 'лесу' is used as the prepositional case of 'лес' (forest) to indicate location.
Я гуляю в лесу.
I am walking in the forest.
In this example, 'лесу' again appears in the prepositional case to describe a specific forest.
В этом лесу много ягод.
There are many berries in this forest.
Here, 'лесу' is employed after the preposition 'на' in its locative function, emphasizing its usage in the prepositional case.