Hämeen Härkätie (Oxen Road of Tavastia) is possibly the oldest road in Finland, connecting Finland Proper to Tavastia Proper, specifically Turku Castle and Häme Castle.
Map of H%C3%A4meen H%C3%A4rk%C3%A4tie, 21450 Tarvasjoki, Finland
References
Hämeen Härkätie Wikipedia(Text) CC BY-SA