Mato Grosso (Brazil) is 3,842 times larger than Des Moines, Iowa.
Mato Grosso is one of the states of Brazil, the third largest by area, located in the western part of the country. Neighboring states are Rondônia, Amazonas, Pará, Tocantins, Goiás and Mato Grosso do Sul. It also borders Bolivia to the southwest. Wikipedia
Area: 235 km2 calculated
Des Moines is the capital and the most populous city in the U.S. state of Iowa. It is also the county seat of Polk County. A small portion of the city extends into Warren County. It was incorporated on September 22, 1851, as Fort Des Moines which was shortened to "Des Moines" in 1857. Wikipedia