A closer view of the boundaries of the eruv can be viewed on this interactive eruv map created by Jonathan Sterman, a Cooper Union student and member of the NYU/Cooper Union Jewish community. One who plans to walk close to the boundary should consult the following directives.
Most of the Eruv consists of fishing wire strung from lamppost to lamppost. It is typically very difficult to see, even if one knows where it is. The most reliable guide to where the Eruv goes is the map and explanation. Furthermore, the wire is designed to survive all natural elements.
On many occasions, the eruv consists of regular buildings. There are no physical markings on these buildings.
On some occasions, there is a gap between the lamppost and the building through which eruv continues. As long as the gap is less than fifteen feet, it is considered a “gateway”, not a break.