In this guide, you will get to know where to find the Posters for the Lingering Malady Quest in the Genshin Impact. You have to follow the steps in this guide to get them.
You can find the Posters from Mondstadt City. You have to go to the location as shown on the map below. After getting there, you can get the poster on the red building.
You can get another poster from the location, which you can see on the map below. You will get it on the roof of the house located to the Southwest of Blacksmith.
After getting the poster from the above location, you need to head to the location as shown in the following map to get another poster. You will get it from the top Mondstadt city walls near the Dawn Winery. There is a whole billboard in that location.
You will need to go to the marked location for the last poster, as shown on the map below. You will get it on the roof of the Alchemy crafting station.
These are the four possible locations on the map to find the Posters in the Genshin Impact.