Rio de Janeiro (Brazil) is 170 times larger than Amarillo, Texas.
Rio de Janeiro is one of the 27 states of Brazil. It has the third largest economy of Brazil, with the largest being that of the state of São Paulo, and the second being that of Minas Gerais. The state of Rio de Janeiro is located within the Brazilian geopolitical region classified as the Southeast. Wikipedia
Area: 257 km2 calculated
Amarillo is the fourteenth most populous city in the state of Texas, also the largest City in the Texas Panhandle, and the seat of Potter County. A portion of the city extends into Randall County. The population was 190,695 at the 2010 census. Wikipedia