Ton Nga Chang Waterfall. Ton Nga Chang Waterfall is located about 25 km. away from Hat Yai city center. This is one of the most popular tourist attractions in Songkhla province and for good reason. If you arrive here following the rainy season you will find the fall at its most spectacular. The water fall is made up of seven stories and on one of these, the water breaks up into two cascades; they look like twins and create a visually stunning effect.