Rather than a sarcophagus being located somewhere on a body, a body may be found in a sarcophagus, a final resting place with a rather eerie origin to its name.
Where on the body would I find my sarcophagus?
The Greeks formed the word sarcophagus to describe the natural material they used to pack up for burial — or inter — dead bodies. Often carved for display above ground, caskets made from this special stone seemed to have amazing properties: Corpses would become consumed quickly, leaving behind only the teeth in a just a few weeks.
Sarcophagus mean "flesh-eating."
Bury your head in classic literature, and you'll dig up lots of references to sarcophagi (the plural form).
From Edgar Allen Poe's gothic short story, "Ligeia":
Wild visions, opium-engendered, flitted, shadow-like, before me. I gazed with unquiet eye upon the sarcophagi in the angles of the room, upon the varying figures of the drapery, and upon the writhing of the parti-colored fires in the censer overhead.
From Herman Melville's novella, Benito Cereno:
. . . all closed like coppered eyes of the coffined — and the state-cabin door, once connecting with the gallery, even as the dead-lights had once looked out upon it, but now calked fast like a sarcophagus lid . . .
From Joseph Conrad's novel, Heart of Darkness:
A grand piano stood massively in a corner; with dark gleams on the flat surfaces like a sombre and polished sarcophagus.