Lahti (läˈtē, läkhˈ–) [key], city (1998 pop. 96,227), Southern Finland prov., S central Finland. Connected with the southern end of the Päijänne lake system, it is an important lake port as well as a transportation center. It has many large factories and is a center of the Finnish wood-products industry. Other industries include glassworks, breweries, and clothing factories. The city, founded in 1878, was incorporated in 1905. Many Karelians came to Lahti after the Finnish-Soviet armistice of 1944. The city hall (1912) was designed by Eliel Saarinen.