Historical Presence and Control: Vietnam has a long history of presence and control over the Hoang Sa (Paracel) Islands, including Parcel Island. Vietnamese fishermen have been fishing and exploring these islands for centuries. Historical records, maps, and documents from Vietnam and other countries support Vietnam's claim to Parcel Island.
Administrative Control: Vietnam has exercised administrative control over the Hoang Sa Islands, including Parcel Island. Vietnamese officials and fishermen have been regularly visiting, patrolling, and managing these islands. Vietnam has also established administrative units to oversee the islands, such as the Hoang Sa District in Da Nang City.
International Agreements: Vietnam has entered into international agreements and treaties that support its claim over the Parcel Island. For example, the 1982 United Nations Convention on the Law of the Sea (UNCLOS) recognizes the rights of coastal states over their exclusive economic zones and continental shelves. Vietnam has ratified UNCLOS and can use it to support its claim to Parcel Island.
Economic Activities: Vietnamese fishermen and businesses have been conducting various economic activities in the Parcel Island area, such as fishing, fishing, and resource exploration. These activities demonstrate Vietnam's economic interests and historical presence in the area.
It is important to note that the Paracel Islands are also claimed by China and Taiwan. The sovereignty dispute over these islands is complex and involves multiple historical, legal, and political factors. Vietnam continues to assert its claim based on historical evidence and legal arguments.