This is an impossible question to answer without having more information. Key rivers featured in The Hobbit and The Lord of the Rings include Anduin, Brandywine and Forest River.
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Anything from Orcs to Hobbits. Any creature or creation in Middle Earth, is Tolkien's.
J.R.R Tolkien had a brother called Hilary Arther Reuel Tolkien born in 1894.
The Last March of the Ents
a recent time
There is no character or creature specifically referred to as a "monstrous Tolkien" in J.R.R. Tolkien's works. However, Tolkien did create many monstrous beings such as Orcs, Trolls, Balrogs, and Shelob in his writings. These creatures are often portrayed as dark and malevolent entities in his legendarium.
Nope.
J.R.R. Tolkien wrote a story called "Roverandom" for his children. It is a fantasy novel about a dog who gets turned into a toy by a wizard and embarks on a series of adventures. Tolkien created this story to entertain his children after one of their toys was lost at the beach.
The History of Middle-earth
A Tolkien tree is called a mallorn tree. These trees are fictional and were created by J.R.R. Tolkien in his Middle-earth legendarium. Mallorn trees have silver bark and golden leaves, and are notably found in Lothlórien.
Edith Mary Tolkien was J.R.R Tolkien's wife. J.R.R Tolkien had four children Christopher John Reuel Tolkien, John Francis Reuel Tolkien, Michael Hilary Reuel Tolkien and Priscilla Mary Anne Reuel Tolkien.
Tolkien creatures are often referred to as "Middle-earth creatures" or "fantasy creatures" as they inhabit the world created by J.R.R. Tolkien in his works, such as "The Lord of the Rings" and "The Hobbit." Some notable Tolkien creatures include hobbits, elves, dwarves, orcs, ents, and dragons.
Arthur Tolkien's birth name is Arthur Reuel Tolkien.