cemetery for those without relatives; potter's field
Refers to a burial ground for people who died without family to care for their graves, or for unidentified/unclaimed bodies. The term 無縁 (muen) means 'without connection' or 'unrelated', and 墓地 (bochi) is 'cemetery'.
There is a potter's field on the outskirts of that town.
共同墓地 is a general public cemetery, while 無縁墓地 specifically refers to a cemetery for those without relatives or unclaimed bodies.
Compound of 無縁 (muen, 'without connection') and 墓地 (bochi, 'cemetery').