Ucayali (Spanish pronunciation: [ukaˈʝali]) is an inland department and region of Peru.

[1] The arapaima is depicted on both the flag and the seal of the region The department of Ucayali is bordered by the Brazilian state of Acre on the east; the department of Madre de Dios on the southeast; Cusco on the south; Junín, Pasco and Huánuco on the west; and Loreto on the north.

[citation needed] According to the 2007 Census, the Ucayali department has a population of 432,159 inhabitants, 51.4% of which (222,132) are male and 48.6% (210,027) are female.

As of 2002[update], the Instituto Nacional de Estadística e Informática estimated the department's population to be 468,922.

Persons originating from other departments of the country make up 34.7% of the population and 0.2% of residents were born abroad.