The term WHERE THE TIBIA IS can be solved by the four-letter word SHIN. The tibia is a long bone in the lower leg, commonly referred to as the shinbone or SHIN. It is the larger of the two bones in the leg below the knee, and it connects the knee to the ankle. The tibia is the second largest bone in the human body, and it plays an important role in supporting the body's weight and providing stability when walking or running.