Across an estuary.
As far as I know, A river's mouth is simply called the 'river mouth'!
Tidal power is harnessed by constructing a dam across the mouth of an estuary or a bay.
The mouth of a river where it meets the sea, with a mixing of fresh and salt tidal water
Tidal Estuary
Tidal Estuary
It is the location of the first "Tidal Power Station" in the world.
The Severn Estuary, but I am not sure what the exact range is.
An estuary is the lower course of a river where the rivers current meets the sea's tide, there is a mixing of sea and salt water. The word comes from Latin 'aestuarium' which means a tidal marsh or opening
Yes the estuary is always a tidal part of the river.
Mixing of river water with sea water occurs where tidal or wave processes interact with river processes. This exact mixing zone is different for each estuary and depends on the relative strengths of river, tidal, and wave processes as well as their relative temperatures and densities.
No. Most brackish water is associated with the ocean. Usually a tidal river estuary.