German East Africa was a German colony in the African Great Lakes region, which included present-day Burundi, Rwanda, the Tanzania mainland, and the Kionga Triangle, a small region later incorporated into Mozambique. GEA's area was 994,996 km2 (384,170 sq mi), which was nearly three times the area of present-day Germany and almost double the area of metropolitan Germany at the time.

Portuguese Mozambique or Portuguese East Africa were the common terms by which Mozambique was designated during the period in which it was a Portuguese colony. Portuguese Mozambique originally constituted a string of Portuguese possessions along the south-east African coast, and later became a unified colony, which now forms the Republic of Mozambique.