FONU2 Inc., which operates Moon River Studios in Effingham County, announced today that it has signed agreements to finance and produce the motion picture film “Mara.” Moon River agreed in October to downsize its massive studio plans from 1,560 acres to 51 acres on property the county’s Industrial Development Authority (IDA) owns on Old River Road at Interstate 16, but the documents making that change have not yet been signed. Meanwhile, the company said in a Dec.