Click on the image for larger size (rough scan though, this is a napkin sketch essentially.)
Everything to the east is future Equestria (whether we choose to use the canonical map
or make up our own Tolkienesque version of future Equestria). -->

<-- To the west is the sea and the Undying Lands of Alinor (aka pony paradise)

Like in FiM (and Bored of the Rings with places like the Bay of Milhous and the Legendary Drillingrigs), some of the place names tend to be lighter and more referential than pony names, which tend to be serious Tolkien - pony conversions.

As mentioned the geography changes quite dramatically at the end of the first age, which is convenient for our purposes. A word on some of the characters / places referenced on the map:

Glamouros and Glow-belle are alicorns (high elves) among the Seven Daughters of Starfall, so the lands depicted are where they live. Luna is one of the Seven Daughters of Starfall, but is half-sister to all the other siblings (she's Celestia's half-sister, since Starfall and her sister the High Queen fought over Luna and Celestia's Dad.) Pinkamena Dianbar, daughter of Píe, was born in Chillyum and briefly becomes chancellor of Neighzohall. Dashion (Dashing) is the Commander of Cloudfountain. Twilight's character is also from Chillyum which is the territory of the alicorns loyal to Celestia's Mom (the High Queen). Celestia and/or Luna formerly occupied the tower that is later Discord's Isle. Luna moved her tower of the Moon to the forest of Namóth, which was after named Lunamóth. Apple's family, headed by grandmother Fujî, live in the orchards of Lemonädy which were laid-waste. Cloudfountain is hidden in the valley of Gyroból surrounded by the peaks of Feathergrim. The Mountains of Madness are occupied by changelings and other monsters, descendants of the horrific spider-being Unpleasant, who spun webs of Unlight there. Fluffy-ponies live in trees in the forest of Osrslÿiand. The Silly-Ponies, last remnants of G1 and G2, were cast out of Alfalfaland and into Dream Valley where they dwindled and became few in number. Generally, alicorns are to the north, unicorns in the middle, pegasi in guarded redoubts (Wingyamar, Cloudfountain), and earth ponies, being less advanced, are scattered all over the place.

You added G1 and G2?

Mainly in terms of historical reference, bringing in a bunch of concepts from the old series as reference to half-remembered "ancient pony history" and fim-ifying them the way the series (and the fic) did with Tirek.

The6thMaster had a similar idea.

But yeah, using a similar conceit: the Smooze, Sea Ponies, and some other stuff are brought up to date and re-imagined as taking place in the ancient pony past during the time frame of the Ponymarillion. (The6thMaster has a GREAT use of one of these ancient animated races in his other fic, which I dare not mess with by using them much.) In a slightly more meta vein, the G1 / G2 design ponies themselves feature as the diminutive Silly-Ponies, a sort of homunculus version of the FiM ponies who still adhere to the old design, who have been sidelined and forgotten by the stronger and more magical unicorns of Alfalfaland.

In the original Silmarillion they are played by the Petty-Dwarves, an ancient race of dwarves who are different from Tolkien's other dwarves and more fairy-tale like.