While the other hunters are from Yoknapatawpha, Mister Ernest and the narrator are from "Van Dorn" (303). This could be the (invented) name of a town in Mississippi, but it seems more likely that it is the name of Ernest's plantation.
Although "the river" in this story is never named (297), there is a good chance that it is the Sunflower River, which flows through Mississippi about 150 miles southwest of Oxford/Jefferson and into the Yazoo River about twenty miles east of the Mississippi. Faulkner himself hunted along the Sunflower in the mid-20th century.
As in "Delta Autumn," the Yoknapatawpha men in the story have to drive in "cars and pickups" to reach their hunting ground (308); as in that earlier story, they travel the last leg of their journey by boat. This is the place upriver "where they leave" their vehicles (308).
As in "Delta Autumn," the Yoknapatawpha men in "Race at Morning" have to drive in "cars and pickups" to reach their hunting ground (308); as in that earlier story, they travel the last leg of their journey by boat. This is the place upriver "where they leave" their vehicles (308).
This is the "ridge" that "runs due south" down which the buck runs after getting past "Uncle Ike's standers" (300). It is "clear of vines and bushes," which allows Mister Ernest's horse to "go fast" (300).
While Mister Ernest and Roth Edmonds hunt on horseback so they can follow the deer and the dogs, the other men in the party hunt from the "stands" that they are assigned by Ike McCaslin (297). The story's reference to a "stand-holder" suggests that these stands are platforms fixed to trees a dozen or so feet above the ground (297), spread out in a line to cover a wider part of the woods and to keep a safe distance between the hunters themselves. The hunters at Hog Bayou camp are also described as "standers" (300), i.e. men who hunt from tree stands.
The hunter's two horses are tied up or hobbled in a "feed lot" across the river from their camp (307), to be ready for each day's hunting in the "big woods" (309). The narrator feeds them corn that is brought into the woods before the last day's hunt begins. The "landing" for the boat that carries the hunters back and forth across the river (307) is "down the bank" from this lot (296).
"Hollyknowe camp" is where a third party of hunters is camped. Like the other two camps, it's near the river, at least twenty miles below the place where the chase began.
Hog Bayou camp is where another group of "five or six" hunters are camped during the hunting season (301). It is "eight miles below" the narrator's camp (300). Ordinarily each group would stay away from the other groups stands and guns, but the buck the narrator and Mister Ernest are chasing leads them right through this party.