Marine structures are constructions designed to operate in or near water bodies, such as oceans, rivers, and lakes. These structures include offshore oil platforms, docks, harbors, and bridges. They are built to withstand harsh marine environments, including strong waves, saltwater corrosion, and varying water levels. The design and construction of marine structures require specialized engineering techniques to ensure safety and durability. Materials like reinforced concrete and steel are commonly used due to their strength and resistance to corrosion. Proper planning and environmental assessments are essential to minimize impacts on marine ecosystems and ensure the longevity of these structures.