  We introduce the concept of entanglement width as measure of the spatial
distribution of entanglement in multiparticle systems. We develop criteria to
detect the width of entanglement using global observables such as energy and
magnetic susceptibility. Therefore, the introduced entanglement criteria can be
applied to systems where addressing of single particles is not possible. We
apply the criteria to different examples such as the J1-J2- Heisenberg model
and point out the difference between entanglement depth and entanglement width.

Quantum Physics