Dvarholm

Place

Dvarholm is the home realm of the Dvar. They also call it the One Mountain. Other people often call it Dwarven Mountain. It's seen as a single realm in the Outlands, in the center of the Outer Planes. However, the One Mountain actually extends throughout the planes. Here is a relevant excerpt from a Dvaren text:

For all its size and glory, the One Mountain is merely a peak. It is the Great Graybeard of a far greater "clan" of mountains stretching across the multiverse. The One Mountain's roots stretch through the Swift to countless worlds. There are veins of ore and gems extending from one plane to another. There are some natural tunnels and even Dvar-carved mines that transit planar borders. These Deep Ways are very sacred to the Mordinsamman, and they are known only to chosen Dvaren champions, messengers, and miners. Some Dvar believe that the Deep Ways lead as far as the Inner Planes, the very fountainheads of stone and fire.