A cotidal line is a line on a map or chart that connects points where the tide reaches its high and low points at the same time. In other words, all locations along this line experience high tide or low tide simultaneously. Cotidal lines are primarily used in tidal studies and oceanography to analyze tidal patterns and movements across coastal regions. They help in understanding the synchronization of tides in different areas, which can be influenced by factors such as the geography of the coastline and local water depths.
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