The Arayashiki Shell Midden (荒屋敷貝塚, Arayashiki kaizuka) is an archaeological site in the Kaizuka neighborhood of Wakaba ward of the city of Chiba, Chiba Prefecture, in the Kantō region of Japan containing a Jōmon period shell midden and settlement ruin. The midden was designated a National Historic Site of Japan in 1979, with its boundaries extended in 1982.

The Kamitakatsu Shell Midden is located on the edge of the hill on the right bank of the Sakura River, which flows into the innermost part of Nishiura in Lake Kasumigaura, on the western outskirts of Tsuchiura City. The site has five shell mounds distributed across a flat surface forming a shell ring with a diameter of about 150 meters.

A shell midden or shell mound is an archaeological feature consisting mainly of mollusk shells. The Danish term køkkenmøddinger (plural) was first used by Japetus Steenstrup to describe shell heaps and continues to be used by some researchers. A midden, by definition, contains the debris of human activity, and should not be confused with wind- or tide-created beach mounds.

Daigigakoi Shell Mound Article Talk Daigigakoi Shell Midden ( 大木囲貝塚 , Daigigakoi Kaizuka ) is an archaeological site consisting of a Jōmon period Shell midden and the remains of an adjacent settlement located in what is now the town of Shichigahama , Miyagi Prefecture in the Tōhoku region of northern Japan .

The Futatsumori Site, known primarily in Japanese as the Futatsumori Shell Mound (二ツ森貝塚, Futatsumori Kaizuka), is an archaeological site consisting of a series of large shell middens and the remains of an adjacent settlement from the Jōmon period, located in what is now part of the town of Shichinohe in Aomori Prefecture in the Tōhoku region of northern Japan.