VERY LONG POST!
Here is an outline of northwestern Middle-earth in the year 151 of the Fourth Age. It was written by the same person who wrote an article in Other Hands (1:16-19) detailing the plots and schemes of Sauron's ficticious daughter Aelindur (whom I'm using in my own chronicle). Unfortunately, I no longer recall the name of the person who wrote this stuff, and I post it here as is, mistakes and all. It's pretty good, and outlines a possible general "state of affairs" in NW Middle-earth circa FA 150.
Cheers,
Steve
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NORTHWESTERN ENDOR: FA 151
The reunited Kingdom of Gondor & Arnor possesses de facto hegemony over northwestern Endor. Formally, the sister realms possess the lands between the Ered Luin, Forochel, the Misty Mountains, Ephel Dúath, and Umbar (apart from the independent but allied state of Rohan and the semi-autonomous Shire). In practice, however, the King's authorities exercise very little control over the Dunlendish tribes of Enedhwaith and each harsh and gloomy and swept around the thus died all hope of Drúwaith Iaur and the natives of sparsely-populated Harondor.
Although united under the same monarch, Gondor and Arnor retain separate legislative, administrative, and military establishments. King Eldarion resides in Minas Tirith and has appointed his son and heir Eldacar to the position of Viceroy of Arnor at the rebuilt capital of Fornost Erain. Traditionally, the King travels north every summer to briefly sojourn in his northern lands.
Arnor
Arnor remains a sparsely populated land despite the King's encouragement of Gondorian colonization through advantageous taxation policies. Its population centers are Lake Evendim, and the Baranduin and Lhûn valleys. Its only major city is Fornost Erain, though there are serious plans to rebuild Tharbad, whose bridge has already been repaired as has the Greenway running from Fornost Erain to the Gap of Rohan. There is also a new fortress at Weathertop, built by the Dwarves of Moria some decades ago.
Gondor
Gondor has changed little since the War of the Ring. Ithilien is gradually being re-populated under Prince Boromir, son of Éowyn and Faramir, who rules his fief from the newly built capital Ost-en-Ernil in the Emyn Amen. Imrahil's granddaughter Wilwarin is Princess of Dol Amroth and fief-holder of Dor-en-Ernil. Her cousin Edrahil is Captain of the Knights of Belfalas. Minas Tirith's fortifications were repaired and strengthened by the Dwarves of Aglarond in early Fourth Age, and the city is now the most well defended location in the region.
The city of Umbar and its rural surroundings are ruled by a governor (currently Prince Boromir's brother Beren) who is directly responsible to the King. The region has been slowly reintegrated into Gondor's territory, but King Eldarion believes it will take more time before it can be turned into a regular province of the realm. He is worried about secessionist strivings among its locals, since the leading citizens of Umbar, even without the interference of Sauron, clearly have other political priorities than Minas Tirith: Gondor looks to the northeast while Umbar looks to the south.
Rohan
The Riddermark has grown stronger over the past century due the demise of its surrounding foes in the War of the Ring, though the lifestyle of the riders has not changed (apart from a growing pride that occasionally takes chauvinistic appearances). The third King of the Third Line, the aged Elfhelm, son of Elfwinë, currently rules the realm. Outside the Hornburg, there is now a growing town, which serves as a center for Westfold. The Dwarves of Aglarond have a thriving business in tools and weaponry, which they exchange for food and other supplies from the locals.
Dunland
The Dunlendish clans are the dominating Mannish group in the area between the Gwathló, the Misty Mountains, the White Mountains, and the Sea. Technically, they are subjects of the Winged Crown, and their chieftains have occasionally expressed words of loyalty to the King in Minas Tirith. In practice, they follow their own leaders and traditions. In secret, most harbor strong hatred towards the Dúnedain and the Rohirrim for denying them what they consider Dunlendish rights. Gondor only controls the Greenway, the rest of the region being the natives' turf, where unwary foreign travelers have sometimes disappeared without a trace.
Mordor
After the War of the Ring, King Elessar gave the land of Núrnen to its slaves. They established the Kingdom of Lithlad, a densely populated agricultural country. It is closely allied to Gondor, and the population has a strong pro-Dúnadan attitude in consequence of their recent liberation. Gorgoroth, however, is an abandoned wasteland. As far as everyone knows, Sauron's strongholds toppled when his power was broken, and Orodruin sleeps.
Rhovanion
The peoples of the upper Anduin vale, Eryn Lasgalen (formerly Mirkwood), the plains of Rhovanion, and Dorwinion have resumed many of their ancient contacts with Gondor. The disappearance of Dol Guldur's Shadow has opened the region for trade and growth, and the Northmen maintain their old friendship with Gondor.
Rhûn and Harad
Little has changed in the old realms of Rhûn and Harad. The inhabitants view Gondor with mixed feelings and worry about the possibility of renewed Dúnadan domination, however benevolent it might be. Many of the realms have long traditions of fighting the Dúnedain and such cultural memories will linger for many centuries.
The Elven lands
The Elves of the Fourth Age show little concern for the affairs of Mortals, knowing that their power has waned with the departure of their mightiest Lords and the destruction of the One Ring. Elves dominate four regions during the early Fourth Age: Lórien (which includes the southern Eryn Lasgalen, or "East Lórien"), the northern Eryn Lasgalen, Lindon, and Rivendell.
Elladan is Prince of Lórien. His Silvan-populated realm encompasses the ruins of Dol Guldur, which is kept under tight surveillance. King Thranduil continues to rule his northern woodland realm, which has suffered little change since the War of the Ring, save for a reduction in the number of giant spiders and other fell creatures in the area. Círdan rules Lindon, whose people maintain the Havens from which the Elves depart for Aman. Elrohir has assumed the position of Lord of Rivendell, which continues to serve as a refuge for the very few Noldor and Sindar that still dwell east of the Blue Mountains.
The Dwarven realms
Moria has been re-populated and is once again the most important Dwarven settlement in northwestern Middle-earth, and the Dwarves of the Blue Mountain dwindle in number as many migrate there. Aglarond has grown into a small but prosperous enclave, while the Lonely Mountain and Iron Hills retain their former importance.
The Servants of the Shadow
Sauron's downfall did not bring about the complete end of his servants. Orcs and Trolls survived in many places, especially in their mountain strongholds at Gundabad and elsewhere in the Hithaeglir. Since the War of the Ring, they have lacked a strong leader and have been reduced to squabbling among themselves, and therefore do not pose a major threat to the Free Peoples. This, however, does not spell an end to the periodic Orkish raids upon the upper Anduin vale. There is talk of Dragons and other hideous creatures in the northern wastes, but they have so far proven mere rumors. But matters might not be so well.
Drunken DM and the Speak with Dead spell: "No, I'm not the limed-over skeleton of the abbot, and no this special key in my boney fingers does not open the door to the secret treasury! ... Oh crap."