The Sightless Sea is by far the largest of the known Vaults of Orv. It lies beneath the Arcadian Ocean, and is of a similar size. There are numerous tiny islands in the sea, many settled by urdefhan, but others claimed by even stranger creatures. On average, the sea is a mile deep, but in places it is much deeper.
The Sightless Sea is linked to the Arcadian Ocean via the "reverse waterspout" known as the Braid, which leads up to the Inverted Sea. A current from the Sightless Sea flows up the Braid, through the Inverted Sea, into the Arcadian Ocean and then into the Inner Sea. From there, it seeps down into Lake Nirthran and eventually finds its way back into the Sightless Sea. In theory, this grants the alghollthus access to most of Golarion, although there have never been any confirmed sightings of alghollthus coming down with the rain that lands in the Midnight Mountains. In fact, alghollthus prefer not to make use of the Braid themselves, instead sending their magically controlled servants up the water column on missions spanning years. Other natives of the Sightless Sea seek to make use of the Braid for their own purposes, but alghollthus prevent access from the sea itself, and their air-breathing slaves mounted on giant bats and blind, flying lizards patrol the air around it. However, some have been known to slip past these defenses.
The alghollthus are the most powerful faction in the Sightless Sea. At one time, they ruled it all, but today they are apparently content with just controlling most of the depths. Other foul creatures live in the deep regions outside of alghollthu territory; the shoggoths are perhaps the worst, and may even pre-date the alghollthus.
Some of the islands are inhabited by urdefhan outposts, while others are populated by genies, neothelids, dragons, exiled fiends, telepathic munavris, and groups of technologically-advanced skum. The sea itself is plied by ships piloted by denizens of Leng, tieflings, munavris clad in jade armor, and even more unusual creatures. Munavris primarily use their naval skills to fight the urdefhan. A nation of sahuagin has also managed to establish a small presence within the Sightless Sea.
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