The Achilles tendon is located at the back of your lower leg, just above your ankle. It is the thick cord that connects the calf muscles—specifically the gastrocnemius and soleus muscles—to the heel bone (calcaneus)
. You can feel it as a prominent cord running down the back of your leg to your heel. This tendon is the thickest and strongest in the human body, enabling movements such as walking, running, jumping, and pushing off the ground by lifting your heel
. It begins near the middle of the calf and inserts into the back of the heel bone, about 4 cm above the heel's base
. In summary, your Achilles tendon is the large tendon at the back of your ankle connecting your calf muscles to your heel bone.