Do not confuse with the department of Ucayali, which has the heading: Ucayali (Peru)

Compendio estadístico. Región Ucayali, 1988: t.p. (Región Ucayali, Perú) p. 9 (created by Ley 24945 in Nov. 1988; includes provinces of Coronel Portillo, Atalaya, Padre Abad, and Purús)