The Bunun people call Guangao Hahaguo, which means "low concave land" because it is a flat and broad saddle between Mount Batongguan and Mount Guangao. Guangao is connected to Dongpu in the north, the tribes along Daxi County in the northeast, and Batongguan in the south. During the Japanese occupation period, the two routes of "Central Line Road" and "Batongguan Traversing Historic Trail" intersect at Guangao, making it an important geographic location for military and for transportation purposes.
According to the data of Showa 11 (1936), there was 13 staff in the Guangao police post, and there were well-equipped houses and sentries.
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