This is the 14715th most frequent Russian word.
песков
The Russian word "песков" is the plural form of "песок," meaning "sands."
Here, "песками" is the instrumental plural form of "песок" (sand), and it describes an abundance of sandy areas.
Этот регион богат песками.
This region is rich in sandy areas.
In this case, "Песков" is a proper noun, referring to an individual with the surname Peskov.
Песков часто выступает с официальными заявлениями.
Peskov often makes official statements.
Again, "пескам" is the dative plural form of "песок" (sand), and it describes the sands of a beach.