How long is a blue whales vains?

A blue whale's veins can be incredibly long, with some of the largest veins, such as the superior vena cava, measuring over 30 meters (about 98 feet) in length. These massive blood vessels are necessary to accommodate the enormous size of the whale's body and to efficiently transport blood throughout its system. The overall vascular system of a blue whale is adapted to support its large mass and high oxygen demands during deep dives.