The former Sultanate of Pattani , which included Cause_to_be_included the southern Thai provinces of Pattani ( Patani ) , Yala ( Jala ) , Narathiwat ( Menara ) —also known as the three Southern Border Provinces ( SBP ) —as well as neighbouring parts of Songkhla Province ( Singgora ) , and the northeastern part of Malaysia ( Kelantan ) , was conquered Conquering by the Kingdom of Siam in 1785 and , except for Kelantan , has been governed Control by Thailand ever since .