Marina Bennett has always believed that the ocean is the only world worth knowing. Raised in the crushing depths of the Abyssal Cradle, she finds comfort in studying deep-sea plants, ancient currents, and the delicate chemistry that sustains life beneath the waves. While her classmates train to become powerful Tideguard warriors, Marina prefers the quiet certainty of observation and discovery. But when a mysterious blue fissure tears through the foundations of the Sunken Academy, everything she has ever known is swept into an impossible catastrophe.Along with her friends Brielle and Silas, Marina is carried far beyond the familiar ocean depths and deposited in a strange mountain basin filled with freezing freshwater. For merfolk whose bodies depend on the ocean's mineral-rich salt, this unfamiliar environment is more dangerous than any battlefield. Their gills burn, their scales begin to deteriorate, and even the strongest swimmers struggle to survive. Trapped beneath towering cliffs and endless forests, the displaced students must find a way to adapt before the mountain's hostile waters destroy them.Yet the mountains hold secrets far older than the academy. As Marina investigates the strange geology surrounding Aethel Tarn, she discovers traces of an ancient civilization whose history connects the lost ocean to the very foundations of the mountain. With the help of Archivist Genevieve, she begins uncovering forgotten machinery, dormant conduits, and the legendary Heart of the Deep-a relic capable of restoring the connection between the sea and the sky.But survival is no longer simply a matter of finding a passage home. Headmaster Ravenscroft knows more about their arrival than he has admitted, while the mountain's woodland inhabitants possess knowledge that could change everything. Marina must learn to trust unfamiliar allies, recognize the hidden strengths of those around her, and challenge the belief that saltwater and freshwater can never coexist.A journey of discovery, courage, and unexpected friendship, Marina and the Lost Ocean explores what happens when an entire world is lost-and when the greatest hope for returning home lies in building a new one together.
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