All these development projects have originated from the frequent and extensive trips made by His Majesty, sometimes accompanied by Her Majesty Queen Sirikit and other members of the Royal Family, to all regions of the Kingdom, using one of the four provincial royal residences as the starting point. They are located in Chiang Mai in the North, Sakon Nakhon in the Northeast, Hua Hin in the Mid-South, and Narathiwat in the Far South.