Třinec

Sister cities

• Žilina
• Bielsko-Biała

History

The first written mention of Třinec is from 1444, but the village was probably founded already in the second half of the 14th century. Politically, the village then belonged to the Duchy of Teschen, a fee of the Kingdom of Bohemia, which after 1526 became part of the Habsburg monarchy. In 1770, the village had about 200 inhabitants and was completely agricultural. The area was rich in iron ore deposits and had sufficient water energy and a high supply of wood, which were the main reasons to establish an iron works there. The iron mill began operation in 1839, becoming the largest in the entire Cieszyn Silesia, and became a major milestone in the history of the village, which reoriented itself to industry. After the construction of the Košice–Bohumín Railway line in 1871, rapid development of the town took place. After the revolutions of 1848 in the Austrian Empire, a modern municipal division was introduced in the re-established Austrian Silesia. The village as a municipality was added to the political and legal district of Cieszyn. According to censuses conducted in 1880–1910, the population of the municipality grew from 1,792 in 1880 to 3,849 in 1910, with a majority being native Polish speakers (growing from 51.4% in 1880 to 96.6% in 1900 and 96% in 1910), accompanied by a German-speaking minority (at most 32.5% in 1880, then dropping to 12.2% in 1900, and up to 24.3% in 1910) and Czech speakers (peaking in 1890 at 17.4%, then dropping to 6.7% in 1910). In terms of religion, in 1910 the majority were Roman Catholics (63.2%), followed by Protestants (34.5%), and Jews (1.9%). The village was also traditionally inhabited by Cieszyn Vlachs, speaking the Cieszyn Silesian dialect. After World War I, the fall of Austria-Hungary and the division of Cieszyn Silesia in…

Geography

Třinec is located about east of Frýdek-Místek and southeast of Ostrava. It lies in the historical region of Cieszyn Silesia, on the border with Poland and also near the border with Slovakia, which is about of the city centre. Třinec lies on the Olza River. The Tyra Stream flows across the municipal territory and joins the Olza in the city centre. The elevation of the built-up area is approximately above sea level. The northern part of the municipal territory is located in the Moravian-Silesian Foothills. The southern, sparsely populated part is located in the Moravian-Silesian Beskids mountain range, which also lies within the Beskydy Protected Landscape Area. The municipal border runs along the peaks of several mountains, including Ostrý (with an elevation of the highest point in Třinec), Smrčina at , Šindelná at , and Javorový at . Třinec has a humid continental climate (Cfb in the Köppen climate classification).

Most-observed species

• Great Tit

  Parus major Linnaeus, 1758 · Aves
  860
• Eurasian Blackbird

  Turdus merula Linnaeus, 1758 · Aves
  859
• Common Chaffinch

  Fringilla coelebs Linnaeus, 1758 · Aves
  770
• Eurasian Blue Tit

  Cyanistes caeruleus (Linnaeus, 1758) · Aves
  674
• Great Spotted Woodpecker

  Dendrocopos major (Linnaeus, 1758) · Aves
  662
• Coal Tit

  Periparus ater (Linnaeus, 1758) · Aves
  608
• Eurasian Nuthatch

  Sitta europaea Linnaeus, 1758 · Aves
  583
• Common Wood-Pigeon

  Columba palumbus Linnaeus, 1758 · Aves
  484

Most recent

• M 2.6 — 2026-04-09
  1 km WNW of Radlin, Poland
• M 2.9 — 2025-04-29
  4 km WSW of Bytom, Poland
• M 3.2 — 2025-01-27
  1 km NE of Radlin, Poland
• M 2.9 — 2024-07-11
  4 km N of Jejkowice, Poland
• M 3 — 2023-10-04
  2 km W of Murcki, Poland
• M 2.8 — 2023-01-12
  2 km ENE of Karviná, Czechia