Where does “pískoviště” come from?

pískoviště (Czech) comes from Czech pískový, from Czech Písek, from Polish piesek, from Proto-Slavic pěsъkъ, from Proto-Indo-European pē(n)s-u-ko-.

pískoviště (Czech): sandbox

Definitions

Step	Language	Word	Meaning
1	Czech	pískový	sand
2	Czech	Písek	—
3	Polish	piesek	Diminutive of pies; young or small dog
4	Proto-Slavic	pěsъkъ	sand
5	Proto-Indo-European	pē(n)s-u-ko-	—

pískoviště — Etymology, Origin & Word History | Etymology Explorer