Arlo's Family Farm is a location in the 2015 Disney/Pixar animated film, The Good Dinosaur. It is the home of Arlo and his family, as well as the place where he and his siblings, Buck and Libby were born.
This agricultural zone is where Arlo's family worked at. Arlo, Buck, and Libby were all born there via eggs. As the name says, it is a farm run by Apatosaurus and the food they mostly harvest are corn equivalent to modern agriculture. Food harvested by Apatosaurus during their hard work must be stored in the silo before winter before they go bad with taking care of pests trying to eat corn also a must to them.
Henry and Ida had lived and worked on the farm on their own until their three eggs hatched and Buck, Libby and Arlo were born. The siblings were taught how to work and care on the farm by their parents; and not long after the silo was built they started the tradition to place their marks on it once they have complete their tasks and have earned their place on the farm. Since Henry and Ida were the first to work on the farm they were the first to places their marks on it, Buck and Libby soon followed while young Arlo struggled.
When the corn in the silo was being eaten by a "critter" Henry used the opportunity to help Arlo earn his mark on the silo, however Arlo was hesitant to hurt the cave boy and let him go. When Arlo and Henry went after him Henry restored Arlo that he can find his way home by following the river, but then a powerful storm appeared. Henry was able to get Arlo to safety, while he got swept away by the raging river. Following Henry's tragic fate, a grave of Arlo's late father is placed in the farm, as winter was drawing in fast and Ida was worried that they wouldn't have enough food to survive it without her late husband's help, but Arlo managed to reassure her as he told his mother that he'll do whatever he can to help. Arlo later spotted the critter from earlier and went after him, which got him swept away from the farm by the river.
Following his father's directions of following the river and heading towards Clawtooth Mountain, Arlo was able to find his way home and was reunited with his family. Since he had "taken care" of the critter (actually bringing Spot back to his adoptive parents), Arlo was finally able to place his mark right next to Henry's.
A113 can be seen formed by picket fences on the wooden fence which is the "chicken" area.