August 3, 2007: The area of the Yura-gawa River and to the west was removed to join the newly established Tango-Amanohashidate-Oeyama Quasi-National Park along with some additional areas, however the park was extended to cover further areas to the east to Yura-gawa River, and in some areas expanded inland, with Kanmuri-jima Island and Kutsu-jima Island being upgraded to special protection areas.
2007年8月3日由良川以西の地域が、新たな地域を加えた上で新設の丹後天橋立大江山国定公園として独立のため指定区域から削除、同時に由良川以東では海岸後背地など指定区域を拡張、冠島・沓島を特別保護地域に格上げ。