Tsay-Begi, also known as Tse' Biyi, is an area located in Navajo County, Arizona. Tsé Biiʼ is a Navajo place name, which translates into English as "Rock Canyon." Tsé Biiʼ is a broad, sandy plain that lays east of Wetherill Mesa and northeast of Mitchell Mesa within Monument Valley Navajo Tribal Park, also known as Tsé Biiʼ Ndzisgaii in Navajo.