The provided source material does not contain information regarding a city named Gar in China. Instead, it describes "gars" as an ancient group of ray-finned fish belonging to the family Lepisosteidae.
Gars comprise seven living species across two genera that inhabit fresh, brackish, and occasionally marine waters in eastern North America, Central America, and Cuba. They are the only surviving members of the Ginglymodi clade, which first appeared during the Triassic period over 240 million years ago. Along with bowfins, they represent one of only two surviving groups of holosteian fish.