The locked door at position 8 is pretty much useless. It's an alternate sewer entrance from the docks after finishing the Horryn questline. It's not like anybody needs it at that point anymore.

Really helpful - what did you use to make the map?

HOneyBe4r - I've done both and south entrance is still closed.

the locked door can be opened from the inside after the final battle of the chapter, just look around a bit after that

@Andreasrex1987
You can enter Horryn through the south gate, but only after you solved the food and medicine quest in the refugee camp.

If you walk up to the wall near the door, you'll get a text, saying something about wind. If you take your lantern out and have enough awareness it'll get marked and you can just go through to the 2 reavers and pass the diplo check or fight them.

You can get into Horryn very early, it's at the other side of the Lighthouse, north of that there's a crossing with the refugee camp and Horryn is south of that.

After entering Horryn you can get to the sewers by going east then south around the wall and entering through the fishermen door, then keep making your way west until you reach an event where you find a girl and can make her tell you about the sewers.

I don't know if the sewers are still accessible if you fail that event but you can find an entrance in an alley north of that spot.

how do you even get into Horryn or find the sewers?

Thanks for this.