Seenchaagh-kiiyaahaang (Seenchaahding-kiiyaahaang), /rock-big(-place) - band/ banda Kato Indijanaca, porodic Athapaskan, sa Big Rock Creeka (Seenchaaghkot) u sjeverozapadnoj Kaliforniji.
Imali su tri sela: Lhtaaghtaahding, "Among the Black Oaks Place"; Seenchaahding, "Big Rock Place"; i Tnaa's'aanding, "Wild Cotton Lies Village".