Vietnam deposits at the United Nations nautical charts and baseline coordinates in the Gulf of Tonkin

Communication dated 12 March 2025 of the Secretary-General of the United Nations to Member States.

The United Nations Secretary-General has just officially announced that Vietnam has completed the procedures for depositing nautical charts and a list of geographical coordinates related to the baseline used to calculate the width of the territorial waters in the Gulf of Tonkin.

The notice dated March 12, 2025 of the United Nations Secretary-General to member countries stated that on March 7, 2025, in accordance with Clause 2, Article 16 of the 1982 United Nations Convention on the Law of the Sea (UNCLOS), the Government of the Socialist Republic of Vietnam deposited with the United Nations a nautical chart together with a list of geographical coordinates of the points determining the straight baseline for the mainland territory in the Gulf of Tonkin and the outer boundary of the territorial sea in this area.

On March 14, 2025, the United Nations website posted detailed information on the deposit content at www.un.org/Depts/los .

The announcement of the UN Secretary-General also stated that the Declaration of the Government of Vietnam dated February 21, 2025 on the baseline for calculating the breadth of the territorial sea in the Gulf of Tonkin will be published in the upcoming official publication of the United Nations entitled "Bulletin of the Law of the Sea".