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

The maps, authorities said, also "failed to include important islands" in the disputed South China Sea waters, where China's territorial assertions overlap with those of its neighbors, including the Philippines and Vietnam.

The "non-compliant" maps, c intended for foreign distribution, cannot be sold because they "endanger national unity, sovereignty and territorial integrity" of China, officials confirmed.

Cartographic materials are a delicate subject for Chinese authorities and its rivals for coral formations, islands and rock formations in the disputed maritime region.

Detailed Compliance Issues

China Customs said that the maps also omitted the nine-segment line, which outlines Beijing's claim over the vast majority of the South China Sea.

The boundary consists of nine dashes which runs hundreds of miles south and east from its southern province of Hainan Island.

The confiscated materials also failed to indicate the oceanic demarcation between mainland China and the Japanese archipelago, customs representatives stated.

Taiwan Status

Officials stated the maps incorrectly labeled "the Taiwan region", without specifying what exactly the mislabelling was.

China considers 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 Taiwanese authorities views itself as distinct from the mainland China, with its own constitution and popularly chosen officials.

Regional Disputes

Conflicts in the South China Sea periodically escalate - just recently over the weekend, when vessels from Chinese authorities and the Philippines participated in another encounter.

Manila accused a Chinese vessel of purposefully hitting and firing its water cannon at a official Philippine ship.

But Beijing claimed the incident happened after the Philippine vessel disregarded multiple alerts and "moved perilously near" the China's maritime craft.

Historical Precedents

The Philippine government and Vietnamese authorities are also highly vigilant to depictions of the disputed maritime region in cartographic materials.

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

The statement from China Customs did not say where the confiscated materials were intended to be sold. The country supplies much of the world's goods, from holiday decorations to office supplies.

The confiscation of "non-compliant cartographic materials" by Chinese customs officers is relatively common - though the number of the maps intercepted in Shandong significantly exceeds previous confiscations. Merchandise that do not meet standards at the customs are eliminated.

In spring, border authorities at an airport in Qingdao confiscated a batch of one hundred forty-three marine maps that included "obvious errors" in the territorial boundaries.

In August, customs officers in the northern province intercepted two "non-compliant charts" that, among other things, included a "improper representation" of the Tibet's boundaries.