Silivrien (si-LIV-ri-en, “Glittering-White") is the old name for the narrow lands surrounding what is now usually known as the Long Lake. The lake, which shares its name with the region, is nestled in a slender valley within the Green Mountains, southeast of Belegof and a short distance from the Western Sea. The waters of the lake are extremely clear, being fed from numerous small mountain streams, and the sun setting behind the rocky peaks sets the whole lake shimmering like innumerable stars. Here is where the waters of the mighty Uinac have their start. To the east, across the Little Greens, lies Carandaur; south, the Pass of Mengovaded; west, across the Great Greens are the plains of Falas Ithil; and to the north, the hills and woodlands of southern Hithuidyr.

Silivrien was sparsely populated even in the time of the Old Kingdom, though it was home to many therapeutic springs and bathhouses catering to the nobility. After the Cataclysm, the heavily Half-Elven population came to be joined by tribes of Rusgwaith in the north and Draugwaith in the south. The various tribes have led a peaceful coexistence, farming their narrow fields and pulling in bounties of fish from the lake’s ample supply. Unlike many nearby lands, however, Silivren has never been united under a single leader – at least not from within.

Silivren’s location has made it host to many wars fought between Carandaur, Falas Ithil, Imladanor, and Hithuidyr, in nearly every imaginable combination. At various times, one king or another has managed to extend their dominion over the whole of the Land of the Long Lake; invariably, however, the locals have risen up and thrown off the yoke – usually with aid from another would-be conqueror. Even Berendroc the Great of Imladanor could not long hold Silivren under his boot, though his attempts at settling the southern parts of the valley with Draugwaith were bearing fruit at the time of his death in 510.

The traditional symbol of Silvrien was a swan. Silivrim typically use whites, grays, greens, and light blues in their clothing and art.