I spent about one hour on Sunday at the Magang intertidal zone (馬崗潮間帶) nearby the village Mao'ao (卯澳) where there remains some stone houses built by the plains indigenous peoples. Info:

https://e-info.org.tw/node/53416

I didn't get to examine the stone houses this time. Let's plan for it next time.

I found this photolog with some details of the stone houses:

https://eisei86.pixnet.net/blog/post/331700794-