索恩杜洞（Son Doong）是越南的一個洞穴系統(tǒng)，被認(rèn)為是世界上最大的地下洞穴之一。這個洞穴位于越南中部的昆侖省，是一處令人驚嘆的自然奇觀。洞穴的主洞穴長約5公里，高度達(dá)到200米，寬度可達(dá)150米，內(nèi)部有河流、瀑布和森林等豐富的自然景觀。

首圖prompt：

Craft an enchanting background illustration that perfectly complements the stories of 'Splashie and the Ocean of Mysteries.' Create a captivating underwater scene that immerses the viewer in the beauty and wonder of the ocean's depths. Use a harmonious palette of blues and greens to evoke the serene yet vibrant atmosphere of the underwater world. Depict intricate coral reefs that teem with colorful marine life, from delicate seahorses to majestic sea turtles. Let the water's surface above be adorned with dancing reflections of sunlight, casting a golden glow.