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Customs authorities in China in eastern Shandong province have confiscated sixty thousand maps that "mislabelled" the self-ruled island of Taiwan, which Beijing claims as part of its sovereign land.

The maps, customs representatives explained, also "omitted important islands" in the South China Sea, where China's territorial assertions conflict with those of its neighbors, including the Philippine government and Vietnamese authorities.

The "non-compliant" maps, meant for export, cannot be sold because they "threaten national unity, sovereignty and territorial integrity" of China, authorities said.

Maps are a delicate subject for China and its rivals for reefs, islands and rock formations in the disputed maritime region.

Specific Compliance Issues

China Customs stated that the maps also omitted the nine-segment line, which defines China's territorial assertion over almost the whole South China Sea.

The line comprises nine dashes which runs a significant distance southeastward from its southern province of Hainan.

The intercepted cartographic items also failed to indicate the sea border between China and the Japanese archipelago, customs representatives stated.

Taiwan Situation

Customs representatives explained the maps mislabelled "Taiwan province", without detailing what exactly the mislabelling was.

China sees self-governed Taiwan as its sovereign land and has kept open the possibility of the use of military action to unify with the island. But Taiwan sees itself as distinct from the Chinese mainland, with its own governing document and elected leadership.

Geopolitical Tensions

Conflicts in the South China Sea sometimes intensify - just recently over the weekend, when vessels from China and the Philippines were involved in another incident.

Philippine authorities accused a China's maritime craft of intentionally colliding with and deploying water jets at a Philippine government vessel.

But Beijing said the confrontation happened after the Philippine ship ignored repeated warnings and "came too close to" the China's maritime craft.

Historical Precedents

The Philippine government and Vietnamese authorities are also particularly sensitive to representations of the South China Sea in cartographic materials.

The popular motion picture from 2023 was banned in Vietnam and modified in the Philippines for showing a maritime chart with the nine-segment boundary.

The announcement from customs authorities did not specify where the confiscated materials were intended to be sold. The country supplies much of the world's goods, from Christmas lights to stationery.

The confiscation of "violating charts" by Chinese customs officers is relatively common - though the number of the maps confiscated in Shandong easily eclipses previous confiscations. Products that are non-compliant at the border control are disposed of.

In spring, customs officers at an air transportation hub in Qingdao seized a shipment of one hundred forty-three marine maps that contained "apparent inaccuracies" in the national borders.

In August, customs officers in the northern province seized a pair of "non-compliant charts" that, in addition to other issues, contained a "improper representation" of the Tibetan border.