Cotidal lines are the set of places where high tide occurs at the same time.
They sometimes all meet at a particular point called the amphidromic point, where the amplitude of the tide is almost null.12
References
References
- "Cotidal line". A Dictionary of Plant Sciences (2 ed.). Oxford University Press. 2006-01-01. doi:10.1093/acref/9780198608912.001.0001. ISBN 978-0-19-860891-2.
- Zavatarelli, Marco. "Dynamic theory of tides" (PDF).