[Ger-Poland-Volhynia] Location of Villages - Kornin Zytin Pietnatego

[Leo Sonnenberg]

I am trying to locate these villages but my map searches have not  
been successful.  I want to know--

             1/ Are the names spelled correctly.

              2/ Where are they located.

             3/ Are Kornin and Zytin different names for the same  
village.

Background:-

On my paternal Uncle's EWZ document he indicates that his father(my  
grandfather) died in Kornin.  My paternal Grandmother on her EWZ  
document indicates that her husband died in Zytin.  I surmise from  
the two EWZ documents that my Grandmother was living with my Uncle in  
Kornin  where he worked. Both my parents, aunts and uncles were born  
in Kurasch/Gruntal area near the old Polish/Russian border.

On my mother's Canadian Marriage Certificate (second marriage) she  
indicates she was born in Pietnatego, Poland?

Leo Sonnenberg