Compléter PolandVersion en ligne How much do you know about Poland? par Barbara Jurzyk 1 population Constitution largest East May bordered member Germany has North Ukraine million Czech celebrates Kaliningrad Republic Russian Poland a of approximately 38 ( 2014 ) , making it the sixth European Union . Poland is by to the West ; the and the Slovak Republic to the South ; and Belarus to the ; and Lithuania and the enclave of to the . The principal centres of population are Warsaw , Krakow , Wroclaw , Lodz and Poznan . Poland its Day on 3 .