O que fica a leste de Rhûn?

De Enciclopédia de Arda:

Even Gandalf had never explored there, and though Aragorn had travelled there, we have no report of his doings.

Of its ancient geography we can glean a little from the Silmarillion:

• far beyond the Sea of Rhûn was another inland sea, the Sea of Helcar,

• and beyond that a range of red mountains known as the Orocarni.

• Somewhere in the lost east, too, lay Cuiviénen and Hildórien, where Elves and Men first awoke: all the Children of Ilúvatar could trace their ancestries back to the eastward regions of Middle-earth.

Mar de Helcar:

On its eastern shoreline lay the mountains of the Orocarni, and at their feet on a small bay was the land Cuiviénen, where the first Elves awoke in Middle-earth.

It was there that Oromë discovered them, and ultimately led many of them on a Great Journey around the northern end of the Sea of Helcar as they set out for Valinor in the distant west.

Orocarni:

A lost range of mountains in the far east of Middle-earth, near Cuiviénen, beneath which the first Elves awoke.

Called the Mountains of the East, the name Orocarni literally translates as 'Red Mountains'.

We know little more about them, except that they were apparently the source of the many streams that ran down into Cuiviénen.

Blue Wizards:

After landing in Middle-earth, they travelled directly into the far east with Curunír (better known as Saruman).

The mission of the Blue Wizards was to travel to eastern lands occupied by Sauron, and help to foment unrest among his subject peoples.

Whether they succeeded or not, even Tolkien was unsure, though he imagined that they had probably failed. It's also uncertain why they remained in the east while Curunír returned

Não há muitos detalhes sobre o que fica a leste de Rhun.

Tirado de Wiki o senhor dos anéis:

Of its ancient geography we can glean a little from The Silmarillion; far beyond the Sea of Rhûn was another inland sea, the Sea of Helcar, and beyond that a range of red mountains known as the Orocarni (Red Mountains). Somewhere in the lost east, too, lay Cuiviénen and Hildórien, where Elves and Men first awoke: all the Children of Ilúvatar could trace their ancestries back to the eastward regions of Middle-earth.

Alguns outros fatos:

Dorwinion está situado em Rhun e é aqui que residem os easterlings.

Quatro dos sete clãs dos anões também moram lá.

É também o lar de elfos perdidos, como Avari e Úmanyar.

Não há outros países ou terras além de Rhun. Como a Rússia, é todo Rhun além das fronteiras orientais do mapa. Para o sudeste é outra terra chamada Khand.

Eu possuía (por uma década) esse imenso mapa de parede de todos os pontos da Terra Média além de Rhun, além dos Desertos do Norte e da Baía de Gelo de Forochel e além de Far Harad. Comprei como dobrável desta revista que havia comprado sobre a Terra Média e vi imagens em miniatura dela online.

Além do grande deserto de Haradwaith, e suas dezenas de pontos oásis, havia margens densamente arborizadas, com uma floresta particular (chuva) com o dobro do tamanho da Floresta das Trevas. E ao sul disso, ilhas fortemente arborizadas. Ele até mostrou Beleriand, como era antes de afundar, com uma ótima representação daquela grande floresta em Beleriand ("Taur-En-something") em comparação com o tamanho de Mirkwood.

No leste de Rhun e Khand, corria uma cadeia de montanhas notavelmente maior que as montanhas Misty e Blue.