The Tyra (also called Tyrka) is a stream in the Czech Republic, a left tributary of the Olza River. It flows through TÃ Âinec in the Moravian-Silesian Region. It is long.
The stream was originally officially named Tyrka (diminutive of Tyra), but during the era of Austria-Hungary it was mistakenly labeled as Tyra by an Austrian soldier, and has retained that name ever since. Locals call the stream only Tyrka, but efforts to officially rename it back to Tyrka were abandoned in 2023 due to the costs it would entail.
The Tyra flows exclusively through the municipal territory of Tà Âinec. It originates in the woods in Tà Âinec-Tyra in the Moravian-Silesian Beskids at an elevation of and flows north through Tà Âinec-Oldà Âichovice to the centre of Tà Âinec, where it enters the Olza River in the area of Tà Âinec Iron and Steel Works at an elevation of . The stream is long. Its drainage basin has an area of .
The longest tributary of the Tyra is the 5.6 km-long stream of Oldà Âichovský potok. In the upper course, until its confluence with the brook of Planá dolina, the Tyra flows through a wooded valley and has a mountainous character.
The occurrence of the fish common minnow and alpine bullhead was documented in the stream.