Country Borders

[Inziladun]

Hmm. This might be more suited to Novices and Newcomers.

In the east (Rohan's) bounds were the Anduin and and west-cliff of the Emyn Muil down to the marshes of the Mouths of Onodló (Entwash), and beyond that river the stream of the Glanhír (Mering Stream) that flowed through the Wood of Anwar to join the Onodló....

UT Cirion and Eorl

The Mering Stream was the western boundary of Anórien, so it seems clear that belonged to Gondor.

The Enedwaith was the name for the land between the Greyflood and the Isen in which lay the country of Dunland.

Minhiriath is considered part of Eriador.

Eriador is a region, not a country or realm of its own.

Mirkwood was merely a forest which lay in the region called Rhovanion, or Wilderland. Part of Rhovanion.

I'm sorry I don't have a map to show you, but I'm sure a perfunctory internet search should turn one up.