by the governments of the United Kingdom of Great Britain and Ireland and the Kingdom of Siam | section

“ 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. ”

“ 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. ”