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Looks like it has something to do with fishing: Google maps link

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Those are Yap Traditional Fish Weirs, according to islandculture.info

In 2008, Yap State Historic Preservation Office (YSHPO) commenced a project to survey the fish weirs (aech) around the main island of Yap. The aech is a stone/rock structure, usually in the shape of an arrow (many have a shaft, some do not), that catch fish after they move inside a catchment area at high tide and are trapped when the tide goes out. It is thought 700-800 aech may be located around Yap's main island which has a coastline of about 100 km in circumference. Yap traditional fish weirs

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They look like stone fish traps or weirs. They are used by native poeple to catch fish on a large scale. They can actually vary quite a bit by culture and can be quite large. Here is a stone and wood one with the same shape

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