On March 31, 2004, Ōyano, along with the towns of Himedo, Matsushima and Ryūgatake (all from Amakusa District), was merged to create the city of Kami-Amakusa and no longer exists as an independent municipality.
The main island comprising Oyano is still called Oyano Island, and is connected to mainland Kyushu by the first of the "Amakusa Five Bridges", Tenmonbashi. Oyano is connected to the rest of Kami-Amakusa City by the second through fifth bridges: Oyanobashi, Nakanobashi, Maejimabashi, and Matsushimabashi.
Oyano Island is home to the Amakusa Shiro Memorial Hall, a museum that documents the history of the Amakusa-Shimabara Rebellion of 1637.
- "Amakusa Shiro Memorial Hall Kumamoto Prefecture, Amakusa District, Oyano Town". Archived from the original on February 15, 2009. Retrieved 2009-04-30.
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