Silesia

geographical name

Si·​le·​sia sī-ˈlē-zh(ē-)ə 

sə-,

-sh(ē-)ə

region of east central Europe in the valley of the upper Oder River bordering on the Sudety Mountains

Note: Formerly chiefly in Germany, Silesia is now chiefly in the eastern part of the Czech Republic and southwestern Poland.

Silesian

sī-ˈlē-zh(ē-)ən 

sə-

-sh(ē-)ən

adjective or noun