This is the entrance to the underground sewers known as the Waterworks in my campaign that takes place in the city Stromreach on the planet of Eberron. This is the first part of the dungeon that players would enter from the direct North of the map 'Waterworks Sewers Dungeon Entrance.' This map was filled with kobolds and allowed players to enter from the southeast through a tiny slit in the wall or through the front door that would be trapped. Players would eventually find out this kobolds are not the source of the problem and have to return to the Waterworks Sewers Entrance. Be as creative as you would like with it though!