Rokytnice nad Jizerou is a mountain resort in the west part of the Giant Mountains. The town is located in elongated valleys of Hutsky stream between mountains massifs Straz (782 m), Certova hora (1022 m) and Lysá hora (1344 m) and along the left (east) bank of the river Jizera.

In winter Rokytnice is also one of the most famous ski resorts in the Czech Republic, with many ski schools and 28 lifts. The dominant Lysa Hora has 8 lifts and 17 ski runs. The official ski runs in Rokytnice are the longest in the Czech Republic.