Semily District () is a district in the Liberec Region of the Czech Republic. Its capital is the town of Semily, but the most populated town is Turnov.
Semily District is divided into three administrative districts of municipalities with extended competence: Semily, Jilemnice and Turnov. Turnov is the only such administrative district in the country, whose borders do not correspond to the borders of the district, and extends also to the neighbouring districts of Jablonec nad Nisou and Liberec.
Towns are marked in bold and market towns in italics:
BÃÂlá - Benecko - Beneà ¡ov u Semil - Bozkov - Bradlecká Lhota - Bukovina u ÃÂisté - Bystrá nad Jizerou - Chuchelna - ÃÂistá u Horek - Háje nad Jizerou - Holenice - Horka u Staré Paky - HornàBranná - Hrubá Skála - Jablonec nad Jizerou - Jesenný - Jestà Âabàv Krkonoà ¡ÃÂch - Jilemnice - Kacanovy - Karlovice - KlokoÃÂà- Koà ¡à ¥Ã¡lov - Kruh - Ktová - LevÃÂnská Oleà ¡nice - Libà ¡tát - Lomnice nad Popelkou - LouÃÂky - Martinice v Krkonoà ¡ÃÂch - MÃÂrová pod Kozákovem - Modà Âià ¡ice - Mà ÂÃÂÃÂná - Nová Ves nad Popelkou - Ohrazenice - Oleà ¡nice - Paseky nad Jizerou - Peà Âimov - Poniklá - Pà Âepeà Âe - Pà ÂÃÂkrý - Radostná pod Kozákovem - Rakousy - Rokytnice nad Jizerou - Roprachtice - Rovensko pod Troskami - Roztoky u Jilemnice - Roztoky u Semil - Semily - Slaná - Struà ¾inec - Studenec - Svojek - Syà Âenov - Tatobity - Troskovice - Turnov - Veselá - VÃÂchová nad Jizerou - VÃÂtkovice - Và ¡eà  - Vyskeà  - Vysoké nad Jizerou - Záhoà Âà- à ½ernov
Semily District briefly borders Poland in the north. The terrain is very diverse, mountainous in the north, foothills in the middle and slightly undulating in the south. The territory extends into five geomorphological mesoregions: Giant Mountains Foothills (most of the territory), Giant Mountains (north), Jeà ¡tÃÂdâÂÂKozákov Ridge (a strip from west to south) and JiÃÂÃÂn Uplands (southwest). The highest point of the district and of the entire Liberec Region is the mountain Kotel in VÃÂtkovice with an elevation of , the 10th highest mountain in the country. The lowest point is the river bed of the Jizera in Và ¡eà  at .
From the total district area of , agricultural land occupies , forests occupy , and water area occupies . Forests cover 23.2% of the district's area.
The most important river is the Jizera, which crosses the territory from north to southwest. Its longest tributaries in the district are the Oleà ¡ka and Jizerka. The Cidlina originates here, but soon after leaves the district. The area is poor in bodies of water.
Most of the Giant Mountains area of the district is protected as the Krkonoà ¡e National Park and belongs to the most valuable area of the country thanks to a significant amount of rare flora and fauna. In the west, two separate parts of the Bohemian Paradise Protected Landscape Area lie within the district. A small part of the Jizerské hory Protected Landscape Area also extends into the territory, although the Jizera Mountains range itself does not extend into the district.
The largest employers with headquarters in Semily District and at least 500 employees are:
The D10 motorway from Prague, which further continues as the R/35 expressway to Liberec, runs along the western border of the district. The most important roads in the district are the I/10 road (part of the European route E65) from Turnov to the Czech-Polish border, the I/35 road (part of European route E442) to Hradec Králové, and the I/14 road from Liberec to Trutnov.
The most important monuments in the district, protected as national cultural monuments, are:
The best-preserved settlements, protected as monument reservations and monument zones, are:
The most visited tourist destinations are the Trosky Castle and Valdà ¡tejn Castle.