is located 2.7 km (1.7 mi) northwest of Naul, near a hilltop overlooking the Delvin River.

It was unknown to archaeology until 1949, when a woman making a visit to Newgrange mentioned, "there are mounds like this on my uncle’s farm."

He found cists, grave goods including a foot bowl and a carved antler pin, urns containing cremated remains and a posthole.

Unlike other passage graves, the tomb at Fourknocks is not believed to have been covered over with stones.

One of these likely served as the cremation site for the bones found in the main tomb and was used for later interments.