Ruvuma Region is one of Tanzania's 31 administrative regions The region covers a land area of 63,669 km2 (24,583 sq mi). The region is comparable in size to the combined land area of the nation state of Latvia. The region is also bordered to the north by the Morogoro Region, to the northeast by the Lindi Region, to the east by the Mtwara Region,the west by Lake Nyasa with Malawi and to the northwest by the Njombe Region. The regional capital is the municipality of Songea.

Morogoro Region is one of Tanzania's 31 administrative regions. The region covers an area of 70,624 km2 (27,268 sq mi). The region is comparable in size to the combined land area of the nation state of Ireland. Morogoro Region is bordered to the north by the Manyara Region and Tanga Region, to the east by the Pwani and Lindi Regions, to the south by the Ruvuma Region and to the west by the Iringa Njombe and Dodoma Regions. The regional capital is the municipality of Morogoro. According to the 2022 national census, the region had a population of 3,197,104.