River

River is a famous racehorse that comes to Horseland to recuperate from a leg injury. He is dark grey with a white mane and tail, and has light blue highlights. His only appearance is "A Horse Named River" and according to this episode, he is the eldest horse who speaks with an elderly voice. He is also very wise. When he was younger and belonged to an unnamed girl in that appears in his flashbacks. Chili wants to be just like River.