What is the keel of a long boat in the vikings?

The keel of a longship in Viking times is the central structural element that runs along the bottom of the vessel, providing stability and strength. It acts as the backbone of the ship, helping to maintain its shape and improve its hydrodynamics. The design of the keel allowed Viking longships to navigate both open seas and shallow rivers, making them versatile for exploration, trade, and warfare. A well-constructed keel was essential for the ship's overall performance and durability.