The heart is located within the rib cage (see fig. 1), under and slightly to the left of the breastbone (sternum). It approximately the size of a clenched fist (see fig. 2). The lungs surround the right and left side of the heart (see fig. 3).

Figure 1: The heart with nearby bony landmarks.

Figure 2: The heart location inside the chest.

Figure 3: Lungs surrounding the heart.