The lymphatic system of mammals rejoins the blood circulatory system at the

The lymphatic system is a network of vessels and tissues that help to remove excess fluids and waste products from the body's tissues. Lymphatic vessels transport a fluid called lymph, which contains immune cells and waste products, away from the tissues and towards the heart. At a certain point, lymphatic vessels converge and join to form larger vessels called lymphatic ducts. These ducts eventually empty into a large vein called the subclavian vein, which is located near the collarbone. Therefore, the answer is the subclavian vein, where the lymphatic system of mammals rejoins the blood circulatory system.