Celestia

From Manual of the Planes (3e):

It is the land of splendor.

It is where ultimate goodness is idealized.

It is law and good, understanding and mercy.

The single sacred mountain of Celestia rises from an infinite sea of holy water to incomprehensible heights. Here, justice, kindness, order, celestial grace, and mercy are the rules. Here, watchful eyes hold the ramparts against evil in all its many forms. Here, all things are beautiful.

The Seven Mounting Heavens are the planar home for mortal souls of kindness and empathy for their fellow creatures. But it is a paradise that fiends of the lower planes would conquer if they could. Mount Celestia is a promise of betterment and ultimate union with the powers of good and law for those worthy. So supplicants of every stripe ascend the layers, one after the other, to the ultimate height of the Heavenly City, and from thence into the Illuminated Heaven.

Bahamut, lord of kindly dragons, resides on Celestia, as well as Heironeous, the god of valor; Moradin, the lord of dwarves; and Yondalla, the goddess of halflings.

From the seashore at the bottom of the first layer to the heights of the seventh, paths wind up the many peaks, ridges, canyons, and passes of Mount Celestia. Somehow, every incline looks up to the next layer, which shines like the sun on the layer below. Each rift eventually leads down past arching waterfalls and rushing brooks to the Silver Sea. Even from many layers above, the ringing chimes of each wave breaking on the shore of Lunia are faintly, reassuringly audible.