The Chapel of Lights
"Furtive faithful gather in the shadows between the many, many candles. A bell tolls in the chapel tower: cracked iron laughter. Beware. The isle is full of voices."
The Chapel of Lights is an island church community located just south of Avid Horizon. Aside from the many candles described in the journal text, you can also see a very large well on the island.
The Smiling Priest and the followers on the island worship the Drowned Man, aka Mr Eaten. As such, it's a stop on the journey North for those Seeking the Name (who might be headed for Avid Horizon - this is speculative).
Unknown to the Dark-Spectacled Admiral in London who thinks they're merely slightly cracked heretics, the inhabitants of the island practice cannibalism. You may accidentally fall into this depraved practice if you partake of the Smiling Priest's hospitality too liberally. Those who have already acquired a taste for human flesh may perform dark rituals here.
Stories and characters
Part of The Sigil-Ridden Navigator's lost memories are explained here.