Nansio is a small port town located in Tanzania. It serves as the capital of the Ukerewe District within the Mwanza Region. The town is situated on the island of Ukerewe, which lies in Lake Victoria within the Tanzanian lake territory.
The area functions as an administrative ward and a significant transportation hub for the region. Specifically, Nansio serves as a port of entry for both passenger and freight shipping services traveling to and from the city of Mwanza.