Warsaw, Krakow, Lodz, Poznan, Gdansk, Wroclaw
Warsaw and Lodz
Warszawa [Warsaw, current capital] and Kraków [Cracow, previous capital].
The biggest cities are Warsaw, the capital and Lodz. However Katowice and its surrounding area are bigger and the cities of Poznan, Wroclaw and Krakow are also very important.
Are you thinking that someone is going to list all the cities in the country of Poland? Check link for a reference to Poland.
There are two places with main seaports in Poland: the first one is Tricity with: - Port of Gdansk - Port of Gdynia the second one is North-Western Coast with: - Port of Szczecin-Swinoujscie. It's difficult to say which one is the most important. They are more or less equal, yet specialising in different tasks.
a lot of cities like about 15
Well there are cities all over Poland, but if you mean the most populous cities, then they are actually pretty spread out; the top three most populous cities all throughout Central/Southern Poland.
West of Warsaw, Poland, is Germany. The two countries share a border, and the western region of Poland is adjacent to Germany. Major cities in Germany, such as Berlin, are located just a short distance from Warsaw.
People in Poland live on the country side and the cities/towns.
Poland
Poland
Warszawa (Warsaw), Kraków (Cracow), Gdańsk, Gdynia, Sopot, Poznań, Łódź, Wrocław, Białystok, Kielce, Katowice, Lublin, Rzeszów.