Estuary
You might be referring to a "delta." The delta is where a river empties into a body of water, typically the ocean or sea. The delta gets its name from the shape created by the branches of the river that spread out in a triangular form where they meet the larger body of water, as the Greek symbol for delta is a triangle. River deltas are notoriously fertile areas as the river's current transports many minerals downstream and deposits them in the soil in the area of the delta, this mineral rich soil is referred to as "silt." The fertility of river deltas made them popular areas for settlement by early civilizations.
The term 'conventional current' is a singular, common, compound noun; a word for current flowing from positive to negative as opposed to electron flow where current flow is from negative to positive.
current
A channel is a passage connecting two bodies of water. The term is also used to indicate a navigable passage, as in a river or harbor.
any place where consumers and producers buy and sell goods and services
velocity
An edge. A horizontal edge, to be more precise.
It is the point where the river empties into a large body of water--a lake, or ocean.
(Of A River) Place where a stream or river flows into a larger body of water.
Current is the generic term to describe the flow of something. This could be electrons in a wire (electric current) - or the movement of water in a river (a water current). It can also be used to denote "now" as in "the current time is 12.00" or "current affairs"
At the coast. This is the term for where land meets the sea.
An estuary is usually where the fresh water of a river meets the salty sea. The mixing of fresh and salt water forms brine.
Paper under consideration is an editing term. It usually means that your paper is being considered by the editors to see if it meets their current needs.
The medical term closest to the body is "proximal." This term describes a structure being closer to the point of attachment or origin within the body.
FlashBack
The literary term that describes this scene is "flashback." A flashback is a narrative device that interrupts the present timeline to depict past events or memories that provide context to the current situation. In this case, Henry's contemplation by the river triggers a flashback that reveals how he arrived at his current circumstances.
Neither. The Swan River is now just a river, and the main river which flows through Perth, capital of Western Australia, one of the states of Australia. "Swan River" used to be the term for the colony made up by the current cities of Fremantle and Perth.