Tavastia Castle or Häme Castle is a medieval castle in Tavastia Proper, Finland. It is located in Hämeenlinna, the city between Helsinki and Tampere. Originally located on an island, the castle now sits on the coast of lake Vanajavesi. The castle consists of a central keep and surrounding curtain walls, enclosed by a moat. The keep originally had five turrets, but only two are apparent today. The curtain wall has a gatehouse, battlements, an octagonal brick corner turret, and a round gun turret. The lower tiers of the keep and curtain wall are of masoned granite and the upper tiers are red brickwork.