Customs authorities in China in eastern Shandong province have intercepted 60,000 maps that "incorrectly labeled" the self-governed island of Taiwan, which Beijing considers part of its territory.
The maps, officials stated, also "left out important islands" in the South China Sea, where China's territorial assertions conflict with those of its neighbors, including the Philippines and Vietnamese authorities.
The "problematic" maps, destined for overseas markets, cannot be sold because they "endanger national unity, sovereignty and territorial integrity" of China, authorities said.
Cartographic materials are a delicate subject for Chinese authorities and its regional competitors for reefs, islands and outcrops in the disputed maritime region.
China Customs said 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 segments which runs numerous nautical miles south and east from its southernmost province of Hainan.
The intercepted cartographic items also failed to indicate the oceanic demarcation between mainland China and Japan, officials confirmed.
Officials stated the maps mislabelled "the Taiwan region", without detailing what exactly the incorrect labeling was.
China sees self-ruled Taiwan as its sovereign land and has maintained the option of the use of military action to unify with the island. But Taiwan views itself as separate from the Chinese mainland, with its own constitution and popularly chosen officials.
Conflicts in the South China Sea sometimes intensify - in recent days over the weekend, when maritime craft from Chinese authorities and the Philippines were involved in another confrontation.
Philippine authorities claimed a Chinese vessel of deliberately ramming and firing its water cannon at a official Philippine ship.
But Chinese officials claimed the confrontation happened after the Philippine ship disregarded multiple alerts and "dangerously approached" the Chinese ship.
The Philippine government and Vietnam are also particularly sensitive to portrayals of the South China Sea in cartographic materials.
The 2023 Barbie film from 2023 was prohibited in Vietnam and censored in the Philippines for showing a maritime chart with the nine-segment boundary.
The declaration from China Customs did not indicate where the seized maps were planned for distribution. China produces much of the world's goods, from Christmas lights to office supplies.
The confiscation of "problematic maps" by China's border authorities is frequently occurring - though the number of the maps confiscated in Shandong substantially surpasses earlier interceptions. Merchandise that are non-compliant at the customs are destroyed.
In March, customs officers at an air transportation hub in Qingdao intercepted a shipment of one hundred forty-three nautical charts that featured "obvious errors" in the sovereign limits.
In late summer, customs officers in Hebei province intercepted a pair of "non-compliant charts" that, in addition to other issues, contained a "incorrect depiction" of the the Tibet region's limits.
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