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Customs authorities in China in eastern Shandong province have seized sixty thousand maps that "improperly identified" the self-governed island of Taiwan, which Chinese authorities considers part of its territory.

The maps, authorities said, also "failed to include important islands" in the disputed South China Sea waters, where Beijing's claims overlap with those of its regional neighbors, including the Philippine government and Vietnamese authorities.

The "violating" maps, destined for overseas markets, 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 rivals for reefs, maritime features and rock formations in the disputed maritime region.

Detailed Violations

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

The demarcation includes nine lines which runs hundreds of miles south and east from its southern province of Hainan.

The seized maps also omitted the sea border between mainland China and the Japanese archipelago, customs representatives stated.

Taiwan Situation

Customs representatives explained the maps incorrectly labeled "Taiwan province", without clarifying what exactly the incorrect labeling was.

The Chinese government sees self-governed Taiwan as its sovereign land and has kept open the possibility of the use of force to unify with the island. But Taiwanese authorities sees itself as distinct from the mainland China, with its own governing document and popularly chosen officials.

Regional Disputes

Tensions in the South China Sea sometimes intensify - most recently over the weekend, when maritime craft from China and the Philippine government participated in another encounter.

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

But Beijing stated the confrontation happened after the Philippine ship failed to heed continual notices and "dangerously approached" the China's maritime craft.

Historical Precedents

The Philippines and Vietnam are also especially concerned to depictions of the disputed maritime region in cartographic materials.

The Barbie movie from 2023 was banned 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 say where the seized maps were destined for sale. The country provides much of the world's goods, from holiday decorations to office supplies.

The interception of "non-compliant cartographic materials" by customs officials is not uncommon - though the number of the maps intercepted in the Shandong region significantly exceeds past seizures. Goods that are non-compliant at the border control are destroyed.

In March, border authorities at an air transportation hub in Qingdao seized a shipment of one hundred forty-three navigation charts that contained "clear mistakes" in the sovereign limits.

In late summer, customs officers in Hebei province seized a pair of "problematic maps" that, besides other problems, contained a "improper representation" of the the Tibet region's limits.