Tanzania is 63% larger than Kenya.
Area: 580,367 km2 World Factbook
Population: 45,010,056 (July 2014) World Factbook
Kenya, officially the Republic of Kenya, is a country in the African Great Lakes region of East Africa. Its capital and largest city is Nairobi. Wikipedia
Area: 947,300 km2 World Factbook
Population: 49,639,138 (July 2014) World Factbook
Tanzania, officially the United Republic of Tanzania, is a country in East Africa in the African Great Lakes region. It is bordered by Kenya and Uganda to the north; Rwanda, Burundi and the Democratic Republic of the Congo to the west; and Zambia, Malawi and Mozambique to the south. Wikipedia