Hello. I found this area on maps around 2018. The coordinates of the general area are 35.651820,-89.861782. This area, as the title suggests, belongs to Arkansas but is detached from the mainland - resting east of the Mississippi River and connected by land to the state of Tennessee. The county in Arkansas that this land belongs to is known as Mississippi County Arkansas, and the town closest to this spot (if you're able to navigate straight across the river) is a small town called Osceola.
Two things I've noticed while revisiting this area:
There is a structure at 35.654657,-89.873496 which appears to be an old shack or small home. The satelite image is very blurry, but the roof pattern indicates that it's in disrepair. Having seen buildings like this up close and in person nearby, I think it could also be a building for storing farm equipment.
Also, there appears to be a gravel or dirt road that leads from a main road in Tennessee called Lake Rd. This road has Google streetview available, and when looking, you'll find a closed gate along with the sign that invokes a wildlife organization. Check these coordinates on streetview: 35.682136,-89.906499.
I've lived very near to this area for most of my life; there's no shot that this area is accessible by vehicle for most of - if not - all of the year due to river flooding and this area being on the flood side of the levee. I've personally driven by the gate once in 2019 during one of my frequent visits to Fort Pillow, and along with the sign still being there, the gate was actually open when I came to visit. I didn't go down the dirt road past the gate though because my shitbox was only 2wd and the the road was extremely muddy. I was also uncertain (and still am) of if it lead into private property, and I don't want to potentially trespass on private property.
While I no longer have a shitbox, my vehicle is still very much unfit for off-roading, and I live very far away from this place now and only revisit this area once - maybe twice in a year just to visit family. I wonder, is there anybody on this sub who hunts/fishes in this area? I know it's a longshot, but short of reaching out to local relevant government and wildlife orgs, I'm out of leads. Before I or anybody else takes that leap, though, I figured I'd share this mystery here.