Registered Tangible Cultural Properties of Japan

Hexagonal brick meter house of 1905 on Mount Handa, Okayama, which metered water sent to the city, with a keystone pediment and granite-framed round windows.

Hexagonal meter house of 1939 on Mount Handa, Okayama, its concrete walls tiled to look like header-bond brick in a simpler copy of the 1905 meter house.

Circular reservoir of 1905 beside the No. 1 basin on Mount Handa, Okayama, with a brick-faced concrete wall, wall vents and a central ventilation tower on top.

An early Showa brewing well and washing floor at a sake brewery in Ushimado, Okayama: a 1.2 m stone-lined well and a 4 by 2.2 m mortar floor. Registered 2007.

A red-brick chimney of about 1932 at a sake brewery in Ushimado, Okayama: 15 m tall, English bond with iron bands, lettered Senju. Nicknamed the red chimney.

An 1830s storehouse in Ushimado, Okayama, with an 8-mat tokonoma guest room under a raised north roof and white plaster and namako-kabe walls. Registered 2007.

A Meiji brewer's house in Ushimado, Okayama, registered in 2007: projecting lattices, namako-kabe and black plaster under a tiled hip-and-gable roof. Exterior only.

Late Edo home of the Himei doctors in Asakuchi, Okayama: sukiya reception rooms with poem-carved transoms west, a 1914 Western-style clinic east. Registered 2015.

Early Meiji gatehouse of the Himei doctors' estate in Asakuchi, Okayama: plastered walls, lattice windows and an offset gabled roof on a stone wall. Registered 2015.

Built in 1928 on the Endo River in Kagamino, Okayama, this 18-metre concrete gravity weir feeds Heisakubara Power Station. Note its curved crest and parallel gates.

This 51-metre concrete settling basin, built in 1928 beside the Endo River weir in Kagamino, Okayama, strips silt from water bound for Heisakubara Power Station.

Built in 1928 in Kagamino, Okayama, this 8.2-metre overflow weir on the Endobara River has a 7.5-metre apron cast in one piece to keep falling water from scouring.

A slender 55-metre concrete settling basin from 1928 in Kagamino, Okayama, fitted with a mid-wall sediment sluice and stone walls against debris from the slope.

Onbara Dam in Kagamino, Okayama, a 94-metre buttress dam of 1928, is the oldest surviving one built for power in Japan and the first to use Mononobe's quake theory.

This 132-metre concrete spillway, built in 1928 on the right bank of Onbara Dam in Kagamino, Okayama, bends twice to slow surplus water before it reaches the river.

Built in 1928 about 270 metres below Onbara Dam in Kagamino, Okayama, this small concrete settling basin is roofed with slabs on its hillside edges against debris.

Built in 1928 in Kagamino, Okayama, this concrete head tank takes water from a 2.3-kilometre channel, flushes out grit and feeds the plant's penstock.

Two granite walls laid in the diagonal tanizumi style in 1928, 68 metres in all, hold up the penstock route and main building of Heisakubara Power Station.

Heisakubara's 1928 concrete powerhouse in Kagamino, Okayama, joins a gabled generator hall to a flat-roofed wing with tall windows, and it still generates power.

Mid-Meiji retaining walls and a stone fence at the Akibagu of Hofukuji, Soja: 3.0 m walls in 3 masonry styles line a long stairway up to the shrine. Registered 2009.