I’ve already acknowledged a contradiction between the infancy narratives of Matthew and Luke, but I’ll do it again. Yes.
The question here we’re dealing with is whether there’s a certain error on the location in Mark. There is not. It is not a slam dunk, as you seem to think. It’s a possible error, but there are perfectly plausible explanations on offer. We all on a daily basis refer to places using nearby places. When talking to a local I’ll tell them I live in Culpeper, but when talking to someone from across the country I’ll tell them I live around Washington because they have no idea where Culpeper is. It’s fully plausible that Matthew, writing for a Jewish audience, would use Gadara to described a location on the east shore of the Dead Sea, while Mark would use Gesara because foreigners would be familiar with it.
Concerning the map, I’d have to know whether it’s an ancient map (unlikely given how few maps have been repserved from Roman times) or a modern estimation of the boundaries.
On the use of “chora”, whatever the dictionary says, the fact is that in the Bible “chora” was often used in the singular for a large region. For instance in Acts 16:6, “the chora of Phrygia and Galatia”, which would be an area almost as large as all of Palestine. (Map) Or in Luke 3:1, “the chora of Ituraea and Trachonitis”, also a large region. (Map) So there’s nothing unreasonable about Mark using the word to indicate a region around Gesara stretching 30 miles, much less Matthew using it to indicate a region around Gadara stretching 6 miles.
It is worth remembering that only one of the two possibilities needs to be correct to eliminate the error. (And I’ve heard a third suggestions that Gergesa, was just another name for Khersa, farther up the coast.)
Ah, back to your usual tactics, I see. You say that the Farris article is bullshit. Are you ready to quote the exact passages in it that lead you to that conclusion? You say we know that Luke’s sources were Mark and Q exclusively. Are you going to explain how you know that? As I showed in the last thread, there’s no shortage of scholars who question the existence of Q, but I don’t want to take up that debate again here. You rule out the possibility that Luke had other sources. Why? B. H. Streeter’s The Four Gospels: A Study of Origins maybe the most famous and influential book in establishing the two-source hypothesis as mainstream. Many people would be surprised to learn that Streeter instead endorsed a “four-document hypothesis”, with additional sources ‘L’ and ‘M’ for Luke and Matthew respectively. Subsequent scholarship has shown that Luke most likely had multiple additional sources beyond Mark and Q. In addition to the article by Stephen Farris which I already mentioned, Dr. Blomberg has tackled the largest section of unparalleled material in Luke, the “travel narrative” of chapters 9-18, and demonstrated that this likely also stems from an earlier written source. (Cite)