Kugunarihama and Kukunakihama: Two Singing Sand Beaches on Japan's Sanriku Coast
In Meiji 27 (1894), the journal Chigaku Zasshi carried the first scientific description of a singing sand beach in Japan. The site was Kugunarihama, a roughly 200-meter strip of quartz sand on the northeast shore of Oshima island, set in the wide mouth of Kesennuma Bay. Walk on it when the surface is dry, and each footstep releases a short, clear "ku-ku" friction sound. Across a narrow strait less than two kilometers away, on the Karakuwa peninsula, lies a second such beach: Kukunakihama, slightly longer and coarser-grained, with the same acoustic property. In September 2011 the two were jointly designated a National Natural Monument under the protection of the Agency for Cultural Affairs.
Singing sand is rare. Roughly twenty beaches in Japan still retain a working acoustic state, and the number has been falling for a century as coastal development and pollution dull the grains. What sets these two apart is their natural setting and the geological coincidence of having a single rock source feeding both shores from opposite sides of the same stretch of water.
How the Sand Sings
The sound is the product of clean, well-sorted quartz grains shearing against each other. When a foot compresses the dry surface, the grains have to slide past their neighbors to make room; if they are uniformly round, similarly sized, and free of organic film, that sliding generates a brief stick-slip vibration audible to the ear. Even a thin coating of oil, sea-bird droppings, or fine industrial dust will silence the effect, often permanently. This is why singing sand is treated as a measure of coastal cleanliness as much as a geological curiosity.
At Kugunarihama, individual grains measure 0.2 to 0.3 millimeters in diameter, and the quartz content is exceptionally high by national comparison; the grains are also slightly angular and elongated rather than fully rounded. At Kukunakihama, the grains are coarser, ranging from 0.2 to 0.4 millimeters, and contain enough dark mineral inclusions to give the sand a faintly grayish-white cast in bright light. Both beaches draw their quartz from the same source: the Late Jurassic Moune Formation and Kogoshio Formation, exposed in the surrounding cliffs and headlands. These are alternating layers of granitic sandstone and mudstone, roughly 150 million years old, which have been weathering and shedding quartz into the local current system for far longer than there have been people to hear the result.
Why the Designation Came in 2011
The Agency for Cultural Affairs cited two of its standard categories in the 2011 designation: criterion (1), the state of occurrence of rocks, minerals, and fossils; and criterion (9), phenomena related to weathering and erosion. The official commentary singled out the pairing itself. Two acoustically active beaches, sharing a sediment source, separated by only two kilometers of strait, with both shores still in close to their original natural condition, was treated as representative of how Japan's coastal singing sand survives best when left largely alone.
Both beaches sit with woodland coming down almost to the high-tide line. Behind Kugunarihama is forest with low sediment runoff and almost no human modification of the slope. Behind Kukunakihama is a secondary forest of deciduous broadleaf trees mixed with Japanese red pine, with some abandoned fields and stands of cedar at the edges. Neither shore has been developed for roads or harbors. The seabed in front of each behaves differently: at Kugunarihama, the floor slopes gently to about ten meters, then drops sharply to twenty and reaches roughly thirty meters offshore; at Kukunakihama, it remains shallow for fifty to sixty meters out before falling away. Local volunteer cleanups, school environmental programs, and municipal protection have kept the acoustic surface intact through decades of coastal pressure elsewhere in the country.
What to Listen For
The sound is short, dry, and unromantic. People who arrive expecting a musical chime are often surprised by how prosaic it is; a clean shuffle of the foot produces a noise closer to creaking leather or a quick squeak of new sneakers than anything melodic. Push down with the ball of the foot and slide, rather than stamping flat, and the effect is at its clearest. Children sometimes draw their fingers across the surface to hear it on a smaller scale.
Conditions matter. The beach is silent when wet, so the best time to visit is a dry afternoon a day or two after rain, when the upper layer has dried but the sand below is still cool and undisturbed. In the height of summer, midday heat can also work the moisture out of an otherwise damp surface. Listening at the water's edge is rarely productive; the active zone lies further back, where the surface dries quickly between tides.
Getting There
For most of the modern era, Oshima island could only be reached by ferry across Kesennuma Bay. That changed on 7 April 2019, when the Kesennuma-Oshima Bridge opened. The bridge, locally nicknamed Tsurukame Bridge, carries a 297-meter arch span across the Oshima Strait and connects the island to the mainland prefectural road network. The drive from the Sanriku Expressway (Urashima-Oshima IC or Kesennuma-Shishiori IC) takes only a few minutes. Once on the island, Kugunarihama is reached on foot from a parking area near Kyukamura resort, with the final approach a marked footpath of about twenty minutes; vehicles cannot enter the protected zone.
Kukunakihama, on the Karakuwa peninsula side, sits in the Nishimoune district of Karakuwa-cho. There is no formal parking lot at the trailhead. A small pull-off near the entrance is used by visitors, and a marked footpath descends through forest to the shore in roughly ten to twenty minutes. Signage is modest by design, in keeping with the protected status of the site. Visitors who arrive on a wet day, or who simply want a controlled demonstration, can stop at the Karakuwa Peninsula Visitor Center, where a tabletop sample of Kukunakihama sand can be made to sing on demand.
The Wider Coast
Both beaches lie within the Sanriku Reconstruction National Park, established after the 2011 Tōhoku earthquake and tsunami to consolidate protection of this stretch of coastline. The Sanriku coast is a classic ria coast, drowned river valleys producing long, sheltered inlets and a forested archipelago at the bay mouths. Oshima itself is the largest inhabited island in northeast Japan, about 9 square kilometers in area, and its highest point, Mount Kameyama at 235 meters, gives a 360-degree view over Kesennuma Bay; a rare green-flowered cherry tree, the gyoikō, grows wild near the summit. On the Pacific side of the island, Odanohama swimming beach was ranked second in Japan in the Ministry of the Environment's 2006 list of best bathing beaches and received Blue Flag certification in 2023.
The Karakuwa peninsula is known for its cliffs, sea caves, and rock formations carved out of the same Jurassic strata that feed the singing sand. Cape Karakuwa, at the peninsula's tip, has a coastal walking trail with views across to Oshima. Visitors interested in the geological story may want to combine a beach visit with a stop at the Karakuwa Peninsula Visitor Center, which interprets the local geology in detail.
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Q&A
- Why is the beach called "eighteen-sounding beach" in Japanese?
- The kanji for Kugunarihama literally read "eighteen-sound beach" (juhachi-nari-hama). The name plays on the sound the sand makes when walked on: "ku-ku." Since "ku" is one reading of the number nine in Japanese, "ku-ku" suggests nine plus nine, which equals eighteen. The reading then shifted phonetically to "kugu-nari." Kukunakihama uses the same play on the same sound, written more directly as "nine-nine sounding beach."
- When is the best time to hear the sand?
- Dry weather, on a day with little wind, when the upper layer of sand has had time to dry out. A clear afternoon in late spring through early autumn works well. Avoid days immediately after rain or heavy fog. The sand will simply not respond if it is damp.
- Can I take a handful of the sand home?
- No. Both beaches are National Natural Monuments under Japanese law, which forbids removing material from the site. Even a small amount taken regularly by many visitors would degrade the deposit. The Karakuwa Peninsula Visitor Center keeps a permitted sample on display for visitors who want to see and hear the sand up close.
- Are the two beaches identical?
- No. They share a geological source but differ in detail. Kugunarihama has finer grains (0.2–0.3 mm), a very high quartz content, and a slightly angular grain shape. Kukunakihama has coarser grains (0.2–0.4 mm), includes some black mineral particles, and looks faintly grayer to the naked eye. The sound is similar to a casual listener but not acoustically identical.
- Are there other singing sand beaches in Japan?
- About twenty in total. Notable examples include Kotohikihama in Kyoto Prefecture, which has an interpretive museum on the phenomenon, and Anegohama in Fukuoka Prefecture. The Kesennuma pair holds a particular place in this group because of the 1894 Chigaku Zasshi report, the oldest scientific record of singing sand in Japan.
Basic Information
| Name | Kugunarihama and Kukunakihama (十八鳴浜及び九九鳴き浜) |
|---|---|
| Category | Natural Monument (Tennen Kinenbutsu) |
| Date of designation | 21 September 2011 |
| Designation criteria | (1) State of occurrence of rocks, minerals, and fossils; (9) Phenomena related to weathering and erosion |
| Location | Kesennuma City, Miyagi Prefecture Kugunarihama: Oshima island, northeast coast (Daihatsudaira area) Kukunakihama: Karakuwa-cho, Nishimoune district |
| Approximate size | Kugunarihama: ca. 200 m long, 20 m wide Kukunakihama: ca. 230 m long, 10–15 m wide |
| Underlying geology | Late Jurassic Moune Formation and Kogoshio Formation (alternating granitic sandstone and mudstone) |
| Access | By car via the Sanriku Expressway and the Kesennuma-Oshima Bridge (opened 2019); final approach on foot via marked footpath |
| Visitor center | Karakuwa Peninsula Visitor Center (sand sample on display) |
| Within | Sanriku Reconstruction National Park |
References
- 国指定文化財等データベース 十八鳴浜及び九九鳴き浜 (Agency for Cultural Affairs, National Cultural Property Database)
- https://kunishitei.bunka.go.jp/bsys/maindetails/401/00003726
- 十八鳴浜 — Kesennuma Official Tourism Information
- https://kesennuma-kanko.jp/kugunarihama/
- 九九鳴き浜 — Kesennuma Official Tourism Information
- https://kesennuma-kanko.jp/九九鳴き浜/
- Sanriku Geopark — 108. Kukunakihama
- https://sanriku-geo.com/geosite/108/
- Kesennuma-Oshima Bridge — Kesennuma Official Tourism Information
- https://kesennuma-kanko.jp/oshimaohashi/
Last verified: 2026.05.19