Map of the Holy Roman Empire in 1648, after the Peace of Westphalia which ended the Thirty Years' War. French version of Holy Roman Empire 1648.svg.
Made from the public domain map "Central Europe about 1648" from the Historical Atlas by William R. Shepherd, at the Perry-Castañeda Library Map Collection at the University of Texas. Further information from Overy, Richard, 2006, The Times Complete history of the world Times Books ISBN 0007181299, and from this map
See also other maps at external links: 

Central Europe 1648
Map on personal site, Europe in 1648
Treaty of Westphalia
1648 map of Prussia
Britannica, Spanish domains in 1648
Astrokey44 &amp; Tinodela