Eriador is a fictional region in J.R.R. Tolkien's Middle-earth, primarily featured in his works like The Hobbit and The Lord of the Rings. It is located in the northwestern part of Middle-earth and is characterized by its diverse landscapes, including rolling hills, forests, and rivers. Key locations within Eriador include Rivendell, the home of Elrond, and the Shire, inhabited by Hobbits. Historically, Eriador was once part of the kingdom of Arnor, which was established by the Dúnedain. Over time, it became less populated due to wars and the rise of other kingdoms. Despite its decline, Eriador remains significant in the lore of Middle-earth, serving as a backdrop for many important events and characters.