Head of tide is the farthest point upstream where a river is affected by tidal fluctuations. This applies to rivers which flow into tidal bodies such as oceans, bays and sloughs. Though this point may vary due to storms and seasonal or annual differences in water flows, there is generally an average point which is accepted as the head of tide. A river's tidal data is recorded at various locations downstream of this point. A river's head of tide may be considered the upper boundary of its estuary. For other meanings, see Estuary (disambiguation) Rio de la Plata estuary An estuary is a semi-enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea. ...

The head of tide is important in surveying, navigation, and fisheries management, and thus many jurisdictions establish a legal head of tide.

The head of tide may be many miles upstream from the river's mouth; for example, on the Hudson River it is located 140 miles upstream near Albany, New York.

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