Niiharu Temple Ruins / Uenohara Tile Kiln Ruins

Niihari Temple Ruins and Uenohara Tile Kiln Site: A Vanished Provincial Temple in Eighth-Century Hitachi

Three earthen mounds line up along an east-west axis in a quiet patch of farmland on the western edge of a low plateau in Chikusei, Ibaraki Prefecture. National Route 50 runs along their southern edge; the Kokai River drains the land to the west. Walk between these grass-covered platforms and you are standing among the foundations of what was, in the eighth century, one of the major Buddhist establishments of Hitachi Province: the official county temple of Niihari District, whose pagodas, halls, and surrounding corridor enclosed an area of roughly 3.8 hectares.

The site is known formally as Niihari Haiji Ato (the ruins of Niihari Temple), together with the Uenohara Tile Kiln Site (Uenohara Kawaragama Ato) about 800 metres to the east, which fired the tiles that once roofed it. Both were designated a National Historic Site by the Agency for Cultural Affairs in 1942, with additional kiln-workshop features added to the designation in 1977. The temple's actual name in the eighth century is not securely known; tiles excavated on site carry the brushed inscriptions "Niihari-ji" (新治寺) and "Ō-dera" (大寺, "the great temple"), and historians refer to it simply as "the Niihari Temple."

A County Temple at the Edge of the Realm

The Niihari district was an ancient administrative unit of Hitachi Province, settled long before the imperial state codified its provinces. The name appears in the Hitachi-no-kuni Fudoki, an eighth-century gazetteer, and even earlier in a legendary song attributed to Yamato Takeru. From the late seventh century onward the central government built a network of provincial and county offices across the country, and beside many of these gūga stood a Buddhist temple: the local administration's sponsored religious house, expressing political authority through architecture and ritual.

That partnership is unusually visible here. Two hundred to three hundred metres south of the temple ruins lie the foundations of the Niihari County Government Office (Niihari Gunga), itself a separate National Historic Site. The county office complex, identified through excavations between 1941 and 1949, was the first gūga site to be archaeologically confirmed anywhere in Japan. Fifty-two building foundations within a roughly 300-metre square indicate administrative halls, granaries, and storehouses arranged in disciplined groups. The temple to the north, sharing the same plateau and the same patron families, completed the picture.

Excavation reports and a local explanatory panel link the temple's construction to Niihari no Atae, the great chieftain (tairyō) of Niihari District in the late early-Nara period, who is thought to have led the project on behalf of the lineage of provincial nobles known as the Niihari Kuni-no-miyatsuko. The same panel suggests that the temple, together with the county office, was destroyed by fire in 817, an event recorded in the early-Heian chronicle Nihon Kiryaku, which notes that thirteen tax granaries at Niihari burned that autumn. Whether the temple itself perished in the same conflagration is inferred from archaeological evidence rather than directly attested.

The Unusual Niihari Plan

Most eighth-century Japanese temples followed one of several standardised plans inherited from the continental and Asuka traditions. The Hōryū-ji type placed pagoda and main hall side by side; the Yakushi-ji type set twin pagodas to the south, in front of the main hall, flanking the central axis. Niihari Temple did neither.

Here the East Pagoda, the Main Hall (kondō), and the West Pagoda sit in a single east-west line. The kondō, slightly oval in plan, occupies the centre: an earthen platform about 1.4 metres high and roughly 18 metres east-west by 12 metres north-south. Ten granite foundation stones survive in their original positions, each carved with a circular column seat where a pillar once stood. To the east stands the East Pagoda's platform, about nine metres square and 1.2 metres tall, with its remarkable central foundation stone still in place: a flat granite slab roughly 1.67 by 1.36 metres, drilled with a circular socket about 55 centimetres across and 22 centimetres deep, the seat for the pagoda's central pillar. The West Pagoda's platform survives in smaller form to the west.

North of the kondō, about twenty-eight metres back, the platform of the Lecture Hall (kōdō) stretches some eighteen metres east-west. A roofed corridor (kairō) once enclosed all four buildings, beginning at the Middle Gate to the south and closing behind the Lecture Hall. This arrangement does not match any other temple plan precisely. Scholars sometimes call it "Yakushi-ji-style adjacent" but distinguish it with its own name: the Niihari-haiji-shiki, or "Niihari Temple style." It remains a regional peculiarity, hinting at how distant provincial builders adapted continental and central-Japanese models to local taste and need.

The Tiles and the Kiln

Roof tiles are the chief diagnostic finds at any Nara-period temple site, and Niihari is no exception. Eaves-end tiles excavated here bear the double-petalled lotus motif characteristic of the late seventh and eighth centuries, and flat eaves tiles carry incised concentric arc patterns. Their design lineage links Niihari to Shimotsuke Yakushi-ji, the great state temple of the neighbouring province (modern Tochigi), which in the Nara period ranked alongside Yakushi-ji in Nara and Kanzeon-ji in Kyushu as one of the three official ordination platforms of Japan. Tile evidence also shows a close relationship with Yūki Haiji, another major county temple to the north.

The Uenohara Tile Kiln Site, designated together with the temple, was the workshop that supplied these tiles when the temple was founded. Set into a low wooded hill in what is now Sakuragawa City, the main kiln has been measured at 13.8 metres long and 3.64 metres wide. Its eastern half formed a long pre-heating chamber, while the western half (a 3.64-metre square) was the main firing floor, with stoking ports at the front and along both sides feeding a grid of fire channels arranged in a cross-hatched pattern before drawing smoke into a flue at the rear wall. Four kilns in total were identified at the site. A later excavation discovered pit dwellings and post-hole buildings nearby, evidence of the tilers' workshops and living quarters; these were added to the historic-site designation in 1977.

What You Can See Today

The Niihari Temple ruins occupy an unfenced clearing of grass and farmland. A stone monument and an explanatory panel installed by the Chikusei City Board of Education stand at the eastern entrance, and a large keyaki (Japanese zelkova) tree marks the platform of the main hall. Walking the site takes perhaps twenty minutes if you pause at each platform; the foundation stones are the most rewarding details, particularly the column seats on the kondō stones and the deep central socket on the East Pagoda stone, which remain entirely legible even after thirteen centuries of weather.

The Uenohara Kiln Site, on the other hand, is harder to read on the ground. The kilns themselves were re-buried for preservation, and what remains is mostly the topography of the wooded slope. A small marker indicates the location. Visitors interested specifically in the tiles are better served by the Chikusei City Heritage Museum (Chikusei-shi Kyōdo Shiryōkan), where some of the excavated material is displayed.

Access is straightforward but rural. JR Mito Line trains stop at Niihari Station, from which the temple ruins are about a thirty-minute walk along secondary roads. By car, the site is along National Route 50 between Chikusei and Sakuragawa, near the Mon-i intersection. There is no dedicated parking lot, and the site itself is open at all hours without an admission fee.

Around the Site

The Niihari Temple ruins are best visited in tandem with the Niihari Gunga ruins immediately to the south; together they form one of the clearest demonstrations in Japan of the eighth-century relationship between provincial administration and Buddhist patronage. A short drive east brings you into the foothills of Mount Tsukuba, the sacred twin-peaked mountain visible from the temple site on clear days. The town of Mama in Sakuragawa, with its historic merchants' houses preserving the look of an Edo-period post town, lies along the same Route 50 corridor.

Saikō-ji temple in Chikusei holds a small bronze standing figure of the infant Shakyamuni, and Myōhō-ji in Sakuragawa preserves a group of Buddhist images; recent research has identified both as likely heirs of statues originally enshrined at Niihari Temple before its disappearance. Visits to those temples are by arrangement.