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

The maps, customs representatives explained, also "omitted important islands" in the disputed South China Sea waters, where China's territorial assertions clash with those of its regional neighbors, including the Philippine government and Vietnam.

The "problematic" maps, destined for overseas markets, cannot be sold because they "compromise national unity, sovereignty and territorial integrity" of China, authorities said.

Maps are a delicate subject for China and its regional competitors for coral formations, maritime features and rock formations in the disputed maritime region.

Detailed Compliance Issues

China Customs stated that the maps also omitted the nine-dash boundary, which defines Beijing's claim over nearly the entire South China Sea.

The demarcation includes nine dashes which extends a significant distance southeastward from its southernmost province of Hainan.

The seized maps also omitted the sea border between China and Japan, officials confirmed.

Cross-Strait Situation

Officials stated the maps incorrectly labeled "Taiwan province", without clarifying what exactly the mislabelling was.

China sees self-ruled Taiwan as its territory and has maintained the option of the use of military action to take the island. But Taiwan views itself as distinct from the Chinese mainland, with its own constitution and elected leadership.

Geopolitical Tensions

Disputes in the disputed maritime region periodically escalate - just recently over the weekend, when vessels from Chinese authorities and the Philippines figured in another encounter.

Manila accused a Chinese ship of deliberately ramming and deploying water jets at a government-owned Philippine craft.

But Chinese officials said the incident happened after the Philippine ship disregarded multiple alerts and "moved perilously near" the China's maritime craft.

Previous Similar Cases

The Philippines and Vietnamese authorities are also highly vigilant to representations of the disputed maritime region in cartographic materials.

The popular motion picture from 2023 was prohibited in Vietnam and modified in the Philippines for showing a South China Sea map with the nine-segment boundary.

The declaration from China Customs did not specify where the seized maps were planned for distribution. The country provides much of the global merchandise, from Christmas lights to office supplies.

The confiscation of "problematic maps" by Chinese customs officers is not uncommon - though the quantity of the maps intercepted in Shandong significantly exceeds earlier interceptions. Products that do not meet standards at the customs are disposed of.

In spring, border authorities at an airport in Qingdao intercepted a shipment of one hundred forty-three navigation charts that featured "apparent inaccuracies" in the national borders.

In late summer, border authorities in Hebei province seized two "non-compliant charts" that, among other things, featured a "incorrect depiction" of the Tibet's boundaries.