Tyrnävä () is a municipality in the North Ostrobothnia region of Finland with a population of (). It covers an area of , of which is water. The population density is . The municipality is unilingually Finnish. The city of Oulu is located about north of the center of Tyrnävä. The most important product of Tyrnävä is potatoes. The municipality has a lot of seed potato production, and the Tyrnävä's region is defined as one of the four high-quality seed potato growing areas in the European Union. Notable people Väinö Kirstinä (1936–2007) References External links Municipality of Tyrnävä – Official website Municipalities of North Ostrobothnia Populated places established in 1865