High are maintained for 60 m., but they do not always prevent the river from inundating the plains of Opole in Lublin and Kozienice in Radom, the waters sometimes extending for 150 m.
With the exception of the Lysa Gora hilly tracts (Kielce and south Radom), which lie within the isotherms of 41° and 42°, Poland is situated between the isotherms of 42° and 46°.
The principal fairs are held at Warsaw (wool, hemp, hops), Lcczyca in Kalisz, Skaryszew in Radom, Ciechanoviec in Lomza, and Lowicz in Warsaw.
Political refugees, formed a confederation at Radom, of Russia whose first act was to send a deputation to St and Poland.
Towards the end of the 14th century the Polish towns even attained some degree of political influence, and their delegates sat with the nobles and clergy in the king's councils, a right formally conceded to them at Radom in March 1384.