Pwani Region is one of Tanzania's 31 administrative regions. The word "Pwani" in Swahili means the "coast". The regional capital is the town of Kibaha. The Region borders the Tanga Region to the north, Morogoro Region to the west, Lindi Region to the south, and surrounds Dar es Salaam Region to the east. The Indian Ocean also borders the region to its northeast and southeast. The region is home to Mafia Island, the Rufiji delta and Saadani National Park. The region is home to Bagamoyo town, a historical Swahili settlement, and the first colonial capital of German East Africa. According to the 2012 national census, the region had a population of 1,098,668, which was slightly lower than the pre-census projection of 1,110,917. From 2002 to 2012, the region's 2.2 percent average annual population growth rate was the seventeenth-highest in the country. It was also the 21st most densely populated region with 34 people per square kilometre., According to the 2022 census the population had nearly doubled to 2,024,947. the region is slightly larger than Belgium.

Tanga Region is one of Tanzania's 31 administrative regions. The region covers an area of 26,667 km2 (10,296 sq mi). The region is comparable in size to the combined land area of the nation state of Burundi. The regional capital is the municipality of Tanga city. Located in northeast Tanzania, the region is bordered by Kenya and Kilimanjaro Region to the north; Manyara Region to the west; and Morogoro and Pwani Regions to the south. It has a coastline to the east with the Indian Ocean. According to the 2022 national census, the region had a population of 2,615,597.