Completar frases PolandVersión en línea How much do you know about Poland? por Barbara Jurzyk 1 Germany May million bordered member Kaliningrad Ukraine celebrates Republic largest East has Czech Russian population Constitution North 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 .