The submarine canyons indent the continental shelf and modify the linear shelf-slope transtition region in to an irregular shape.

• 宜兰海脊由宜兰陆棚向东南延伸形成一个长而窄的地形高区，此海脊分隔了南方的弧前南澳盆地与北面的弧后冲绳海槽。