The First Cuniform is one of the tarsal bones
in the foot.
The location of the First Cuniform is indicated
in the diagram opposite - where all the tarsal bones are shaded
blue to identify the group of them as a group.
See the Revision page about Bones
of the Foot, Ankle, and Lower-Legs for further information
including a larger fully labelled diagram. This may be particularly interesting
study/revision material for students following courses in Reflexology
because such courses generally require a good basic knowledge of the
skeletal structures of the hands and feet.