# Cotidal line

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**Cotidal lines** are the set of places where [high tide](/source/High_tide) occurs at the same time.

They sometimes all meet at a particular point called the [amphidromic point](/source/Amphidromic_point), where the amplitude of the [tide](/source/Tide) is almost null.[1][2]

## References

1. ["Cotidal line"](https://www.oxfordreference.com/display/10.1093/oi/authority.20110803095642258). *A Dictionary of Plant Sciences*. 2 ed. Oxford University Press. 2006-01-01. [doi:10.1093/acref/9780198608912.001.0001](https://doi.org/10.1093/acref/9780198608912.001.0001). ISBN 978-0-19-860891-2.

1. Zavatarelli, Marco. ["Dynamic theory of tides"](https://core.ac.uk/download/pdf/31067737.pdf)

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