Original: The river has its source in the Jizera Mountains near Nová Ves nad Nisou , Czech Republic , reaching the tripoint with Poland and Germany at Zittau after , and later forms the Polish-German border on a length of .
Simplified: The Lusatian Neisse is a river in the Czech Republic ( Lu ická Nisa ) , Germany ( Lausitzer Neiße ) and Poland ( Nysa u ycka ) .