Per Ms. Romanoff's request, I have completed a full geographical study and analysis of the border location of the 'Ghost Line,' including its distance and relation to Dunwich town proper. I have attached the map to this message so that the rest of you can avoid inadvertently crossing the barrier. I apologize for any error in scale. I am not a cartographer, but I did attempt to be thorough. At the bottom of the map you will see a ratio indicator to improve the mathematical preciseness of the drawing.
Please note the areas where the edge of the border converges with vehicular thoroughfares and bodies of water. Although I have not yet tested the outcome, I surmise that crossing this border whilst swimming could result in physical damage to the corporeal body left behind. It should also be noted that local vehicles and residents do not appear to be affected by this anomaly. As such, traversing a busy street or causeway while entering this 'Ghost Realm' may prove fatal if they do not see you in time.
Also, I am Spock. My appreciation to Mr. Boorman who assisted in this endeavor.
You may state your questions below.
[ATTACHMENT: MAP OF THE GHOST LINE]
UPDATED TO ADD:
[ATTACHMENT: DOWNLOADABLE MOBILE MAP APPLICATION COMPLETE WITH GPS TRACKING OF THE USER IN RELATION TO THE GHOST LINE]