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Customs authorities in China in the coastal province of Shandong have intercepted 60,000 maps that "incorrectly labeled" the self-ruled island of Taiwan, which Chinese authorities claims as part of its sovereign land.

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

The "violating" maps, meant for export, cannot be sold because they "endanger national unity, sovereignty and territorial integrity" of China, officials confirmed.

Cartographic materials are a contentious issue for Chinese authorities and its regional competitors for coral formations, maritime features and outcrops in the disputed maritime region.

Detailed Compliance Issues

China Customs explained that the maps also failed to include the nine-segment line, which demarcates China's territorial assertion over nearly the entire South China Sea.

The demarcation includes nine lines which runs numerous nautical miles south and east from its southernmost province of Hainan.

The intercepted cartographic items also did not mark the sea border between mainland China and Japan, authorities said.

Cross-Strait Status

Customs representatives explained the maps incorrectly labeled "the Taiwan region", without clarifying what exactly the improper identification was.

China views self-governed Taiwan as its sovereign land and has maintained the option of the use of military action to take the island. But Taiwanese authorities considers itself separate from the Chinese mainland, with its own constitution and elected leadership.

Geopolitical Disputes

Conflicts in the disputed maritime region periodically escalate - just recently over the weekend, when vessels from China and the Philippines were involved in another incident.

Manila claimed a Chinese vessel of intentionally colliding with and using water cannons at a Philippine government vessel.

But Chinese officials claimed the encounter happened after the Philippine ship disregarded multiple alerts and "came too close to" the Chinese vessel.

Historical Precedents

The Philippines and Vietnamese authorities are also particularly sensitive to portrayals of the disputed maritime region in cartographic materials.

The Barbie movie from 2023 was prohibited in the Vietnamese market and edited in the Philippines for displaying a South China Sea map with the nine-segment boundary.

The statement from China Customs did not specify where the confiscated materials were intended to be sold. China provides much of the global merchandise, from Christmas lights to stationery.

The seizure of "violating charts" by China's border authorities is not uncommon - though the number of the maps confiscated in Shandong significantly exceeds previous confiscations. Goods that do not meet standards at the customs are disposed of.

In spring, customs officers at an airport in the coastal city seized a batch of one hundred forty-three marine maps that contained "apparent inaccuracies" in the national borders.

In late summer, customs officers in Hebei province confiscated a pair of "non-compliant charts" that, besides other problems, included a "improper representation" of the the Tibet region's limits.