The lunate bone (semilunar bone) is a carpal bone (wrist bone) in the human hand that may be distinguished by its deep concavity and crescentic outline. It is situated in the centre of the proximal row of the carpus (wrist) region between the fore arm and hand (manus). In standard medical posture, the lunate carpal bone is situated between the lateral Scaphoid bone and medial Triquetral bone.