At present the protected area stretches 15 kilometers from the headwaters of the Tanayiku to the Tsengwen River, with a breadth of five kilometers in each direction from the center of the stream.
目前達娜依谷溪保護區範圍，由源頭到與曾文溪匯流處共長十五公里，寬度從溪流中間向兩岸延伸五公里。