Structure
Like other outer planes, the Abyss is spatially infinite.
In the standard third edition D&D cosmology, the first layer shares its borders with the neighboring planes of the Windswept Depths of Pandemonium and the Tarterian Depths of Carceri; travel is possible between the Abyss and these planes at certain locations. The River Styx flows through the Abyss to many other lower planes, and as such can be used to gain access to those planes.
In the Forgotten Realms cosmology the Abyss links via the Astral Plane, to Toril, the Material Plane. A number of portals directly connect it with the Barrens of Doom and Despair, Clangor, and on occasion, with, Deep Caverns and The Fated Depths. The River of Blood originates in the Abyss and flows through the lower planes, allowing travellers access to those planes by navigating the river.
In fourth edition D&D, the Abyss lies at the bottom of the Elemental Chaos.
Read more about this topic: Abyss (Dungeons & Dragons)
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