Jablonec nad Nisou District is divided into three administrative districts of municipalities with extended competence: Jablonec nad Nisou, Tanvald and Železný Brod. In addition, two municipalities (Jenišovice and Malá Skála) belong to the administrative district of Turnov, which is the only such administrative district in the country whose borders do not correspond to the borders of the district.
List of municipalities
Cities and towns are marked in bold and market towns in italics:
Jablonec nad Nisou District borders Poland in the northeast. The terrain is very rugged, mountainous in the north and hilly in the south. The territory extends into six geomorphological mesoregions: Jizera Mountains (north and centre), Giant Mountains (east), Giant Mountains Foothills (southeast), Zittau Basin (west), Ještěd–Kozákov Ridge (a strip in the south) and Jičín Uplands (south). The highest point of the district is the mountain Luboch in Harrachov with an elevation of 1,296 m (4,252 ft). The lowest point is the river bed of the Jizera in Malá Skála at 254 m (833 ft).
From the total district area of 438.9 km2 (169.5 sq mi), agricultural land occupies 128.7 km2 (49.7 sq mi), forests occupy 257.6 km2 (99.5 sq mi), and water area occupies 6.4 km2 (2.5 sq mi). Forests cover 58.7% of the district's area.[1]
The most important rivers are the Lusatian Neisse, Jizera and Jizera's tributary, the Kamenice. The area is poor in bodies of water. The largest bodies of water are the reservoirs Josefův Důl and Souš.
Most of the Giant Mountains area of the district is protected as the Krkonoše National Park and belongs to the most valuable area of the country thanks to a significant amount of rare flora and fauna. The entire north of the district belongs to the Jizerské hory Protected Landscape Area. The Bohemian Paradise Protected Landscape Area extends into the district in the south.
There are no motorways in the district territory. The R/35 expressway, the continuation of the D10 motorway from Prague to Liberec, runs along the western border of the district. The most important road that pass through the district is the I/14 road from Liberec to Trutnov.