Lake boats were once important summer transport providers. These services are now largely kept on as cruises, and make a great, leisurely way to journey between towns. The most popular routes are Tampere–Hämeenlinna, Tampere–Virrat, Savonlinna–Kuopio and Lahti–Jyväskylä.
Coastal routes include Turku–Naantali, Helsinki–Porvoo and ferries to the Åland Archipelago.
The website http://lautta.net is handy for domestic lake-boat and ferry services.