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Rock Formations Around Aoshima (“Ogre’s Washboard”)

The unusually shaped fields of rock that jut out of the sea around Aoshima are known locally as the “ogre’s (or devil’s) washboard,” because they are thought to resemble a giant washboard when seen from afar. This rock formation is made up of alternate layers of sand and mud that accumulated under water between 24 and 2 million years ago. The layered rock then emerged from the sea at a slight angle as a result of tectonic activity and land uplift. As the waves battered the rock, the soft mudstone layers were eroded faster than the harder sandstone, creating the ridges in the rock. These rock formations are found along an 8-kilometer stretch of the Miyazaki coastline, south from Aoshima past Tosakibana Cape toward the island of Kinchakujima. The “ogre’s washboard” at Aoshima is designated a Natural Monument of Japan.

環繞青島的奇岩（「魔鬼的洗衣板」）

在圍繞青島的海岸上，佈滿了一排排筆直延伸到海裡的奇異的岩層，當地人稱之為「魔鬼的洗衣板」，因為遠遠看去它們就像是一塊巨大的洗衣板。這種岩層在中新世晚期（700萬年前）由沙泥在海水中分層沉積後交替堆疊而成。此後的地殼運動和地殼抬升，讓這些層狀岩石以略微傾斜的角度升上海面。隨著海浪拍擊岩石，相對柔軟的泥岩層比硬度較高的砂岩層更快被侵蝕，於是漸漸在岩體上形成波狀紋路。這些奇異的岩層順著宮崎海岸綿延8公里，北起青島，經戶崎鼻岬直至巾着島。

「魔鬼的洗衣板」現已被指定為日本天然紀念物。

环绕青岛的奇岩（“魔鬼的搓衣板”）

在环绕青岛的海岸上，布满了一排排笔直延伸至大海中的奇异岩层，本地人称这样的景观为“魔鬼的搓衣板”，因为远远看去，它们就像是一整块巨大的搓衣板。这些岩层由中新世晚期（700万年前）的沙泥在海水中分层沉积后交替堆叠而成。之后，由于地壳运动和地壳抬升的作用，这些层状岩石以略微倾斜的角度露出了海面。在长年海浪的拍击下，较为柔软的泥岩层比相对硬实的砂岩层更快遭到侵蚀，从而渐渐在岩体上形成了波状纹路。这些奇异的岩层顺着宫崎海岸线绵延8公里，北起青岛，经户崎鼻岬，直至巾着岛。

“魔鬼的搓衣板”现已被指定为日本天然纪念物。