Zimbabwe is 397,509 times larger than Round Rock, Texas.
Area: 390,757 km2 World Factbook
Population: 13,771,721 (July 2014) World Factbook
Zimbabwe, officially the Republic of Zimbabwe, is a landlocked country located in southern Africa, between the Zambezi and Limpopo rivers. It is bordered by South Africa to the south, Botswana to the southwest, Zambia to the northwest and Mozambique to the east. The capital is Harare. Wikipedia
Area: 1 km2 calculated
Round Rock is a city in the state of Texas within the Greater Austin, Texas metropolitan area and Williamson County. The 2013 census estimate places the population at 109,821. Wikipedia