# Treaty between the United Kingdom and Siam (1909)/Annex 1

Annex 1.
Boundary Protocol annexed to the Treaty dated March 10, 1909.
The frontiers between the territories of His Majesty the King of Siam and the territory over which his suzerain rights have by the present Treaty been transferred to His Majesty the King of Great Britain and Ireland are as follows :—
Commencing from the most seaward point of the northern bank of the estuary of the Perlis River and thence north to the range of hills which is the watershed between the Perlis River on the one side and the Pujoh River on the other; then following the watershed formed by the said range of hills until it reaches the main watershed or dividing line between those rivers which flow into the Gulf of Siam on the one side and into the Indian Ocean on the other; following this main watershed so as to pass the sources of the Sungei Patani, Sungei Telubin, and Sungei Perak, to a point which is the source of the Sungei Pergau; then leaving the main watershed and going along the watershed separating the waters of the Sungei Pergau from the Sungei Telubin, to the hill called Bukit Jeli or the source of the main stream of the Sungei Golok. Thence the frontier follows the thalweg of the main stream of the Sungei Golok to the sea at a place called Kuala Tabar. This line will leave the valleys of the Sungei Patani, Sungei Telubin, and Sungei Tanjung Mas and the valley on the left or west bank of the Golok to Siam and the whole valley of the Perak River and the valley on the right or east bank of the Golok to Great Britain. ​Subjects of each of the parties may navigate the whole of the waters of the Sungei Golok and its affluents. The Island known as Pulo Langkawi, together with all the islets south of mid-channel between Terutau and Langkawi, and all the islands south of Langkawi shall become British. Terutau and the islets to the north of mid-channel shall remain to Siam. With regard to the islands close to the west coast, those lying to the north of the parallel of latitude where the most seaward point of the north bank of the estuary of the Perlis River touches the sea shall remain to Siam, and those lying to the south of that parallel shall become British. All islands adjacent to the eastern States of Kelantan and Tringganu, south of a parallel of latitude drawn from the point where the Sungei Golok reaches the coast at a place called Kuala Tabar, shall be transferred to Great Britain, and all islands to the north of that parallel shall remain to Siam. A rough sketch of the boundary herein described is annexed hereto. 2. The above-described boundary shall be regarded as final, both by the Government of His Britannic Majesty and that of Siam, and they mutually undertake that, so far as the boundary effects any alteration of the existing boundaries of any State or province, no claim for compensation on the ground of any such alteration made by any State or province so affected shall be entertained or supported by either. 3. It shall be the duty of the Boundary Commission, provided for in Article 3 of the Treaty of this date, to determine and eventually mark out the frontier above described. If during the operations of delimitation it should appear desirable to depart from the frontier as laid down herein, such rectification shall not, under any circumstances, be made to the prejudice of the Siamese Government.
In witness whereof the respective Plenipotentiaries have signed the present Protocol and affixed their seals.
Done at Bangkok, in duplicate, the 10th day of March, 1909.
(L.S.)RALPH PAGET.
(L.S.)DEVAWONGSE VAROPRAKAR.