The southern, sparsely populated part is located in the Moravian-Silesian Beskids mountain range, which also belongs to the Beskydy Protected Landscape Area.

[5] 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.

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.

[8] Following the Munich Agreement in October 1938, together with the Trans-Olza region, it was annexed by Poland, administratively adjoined to Cieszyn County of the Silesian Voivodeship.

The municipalities of Guty, Karpentná, Nebory, Oldřichovice, Ropice, Tyra, and Vendryně were joined to Třinec in 1980.

[15] The year's biggest event is the Hutnický den ("Metallurgy Day"), which features numerous live performances from bands and artists from all over the country and abroad.

[16] From 1993 to 2012, one of the oldest and most famous rock festivals in the Czech Republic, Noc plná hvězd ("star-studded night"), was held here every year.

[17] The city is represented by the successful ice hockey team HC Oceláři Třinec, which has been playing in the Czech Extraliga since 1995 and has won four times.

Oceláři (Steelers) play their home games at Werk Arena, which opened in 2014 and has a seating capacity of 5,400.

[18] The arena also hosted the Team Czech Republic at the 2016 Davis Cup World Group.

[20] Sports that have a tradition in Třinec include orienteering, weightlifting, Greco-Roman wrestling, road cycling, and chess.