Japan Geography Quiz | Reading Chūgoku and Shikoku Dunes, Lakes, Rivers, and Coasts, Set 6

Sand in the Tottori Dunes originates as weathered rock in the Chūgoku Mountains and is carried to the Sea of Japan by the Sendai River. Waves and coastal currents move sand toward the shore, and strong northwesterly winds carry it inland and deposit it. The roles and directions of the river, sea, and wind must all connect correctly.

Water from the Hii River enters Lake Shinji, passes through the Ōhashi River into Lake Nakaumi, and reaches the Sea of Japan through the Sakai Channel. Seawater also moves in from the Sea of Japan, so the two lakes contain a mixture of fresh and salt water and are brackish. The Ōhashi River and Sakai Channel must not be reversed.

Okayama's three major rivers are the Yoshii, Asahi, and Takahashi from east to west. All have headwater areas in the Chūgoku Mountains in the north, flow south, and empty into the Seto Inland Sea. Placing the Takahashi at the eastern edge reverses the geography.

Central Hiroshima developed on the Hiroshima Plain, including the delta at the lower Ōta River. Low alluvial land divided by distributary channels is consistent with a delta. A volcanic plateau or caldera is not produced by river sediment deposition.

At Akiyoshidai, water gradually dissolves soluble limestone, producing karst features such as dolines, karrenfields, and underground caves. Cooling lava can create features such as columnar joints, but it does not explain the combination of limestone caves and dolines.

Kagawa has the Sanuki Mountains in the south and the Sanuki Plain in the north. Its low rainfall and short, steep rivers make a stable water supply difficult, so many ponds developed across the plain to store rainwater and other water for agriculture.

The Yoshino River rises in Kōchi, passes through the Ōboke and Koboke gorges in the Shikoku Mountains, and enters Tokushima. It then flows east, forms the Tokushima Plain downstream, and empties into the Kii Channel. The Tokushima Plain is a downstream area, not the river's source.

The Sadamisaki Peninsula extends west from Ehime into the Bungo Channel and separates the Seto Inland Sea to the north from the Uwa Sea to the south. The Uwa Sea coast has an indented ria shoreline. The Sea of Japan and Ariake Sea do not border this peninsula.

Kōchi lies in southern Shikoku, with the Shikoku Mountains along its northern boundary and the Pacific Ocean and Tosa Bay to the south. The Chūgoku Mountains and Seto Inland Sea pairing describes a different north–south arrangement and does not fit a cross-section of Kōchi.

Around the mouth of the Niyodo River, Kōchi's coast changes from predominantly uplifted coast in the east to a western ria coast with many inlets formed by submergence. The east includes lowland around Urado Bay and the west has scattered sandy beaches, so describing either side as a single landform without exception is inaccurate.