prohlubeň angolul

depression [depressions]▼(geography: low area)
noun
[UK: dɪ.ˈpreʃ.n̩] [US: də.ˈpreʃ.n̩]

hollow [hollows]▼(sunken area)
noun
[UK: ˈhɒ.ləʊ] [US: ˈhɑːlo.ʊ]

indentation [indentations]▼(recess or sharp depression in a surface)
noun
[UK: ˌɪn.den.ˈteɪʃ.n̩] [US: ˌɪn.ˌden.ˈteɪʃ.n̩]