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The importance of blue carbon is significant in terms of climate change mitigationand marine ecosystem conservation, and halophyte acts as a crucial reservoir for thisblue carbon. Accordingly, this study utilized unmanned aerial vehicle (UAV) opticalsensors to create a distribution map of vegetation in the natural salt marsh of theJujin estuary. The optical images captured from a UAV at an altitude of 50 m provideultra-high-resolution optical information with a ground sampling distance of 0.6 cm. Based on these images, a U-Net model was trained to classify Phragmites communisand Suaeda maritima, generating a classification map of the mixed habitats of saltmarsh plants. The areas of Phragmites communis and Suaeda maritima in the Jujin-Cheon region were found to be 6,653.23 m² and 1,409.08 m², respectively. Theclassification results were validated using field control point data, confirming anapproximate classification accuracy of 92%.