Kaburagoshi Lamprophyres

These lamprophyre dikes are a famous geological site where black lamprophyres are embedded in the cracks of white granite, creating a black and white stripe pattern.

One of the world's rarest dike formations, it was designated a National Natural Monument in 1942.
During low tide, you can even take a walk and see the lamprophyre dikes up close.
The area around Higashikagawa has many other sites with fascinating geological features as well.