You may need a visa for Tanzania if you have a Nauruan passport
Visa options for Tanzania (3)
Visa on arrival
Travellers need a visa to visit Tanzania for Business or Tourism. Travellers can get a visa on arrival for a maximum of 90 days in Tanzania at the port of entry, such as an international airport or border crossing.
This is not offered by sherpa°.
Apply on the government site.
You don't need a visa. You can travel to your destination for a limited stay. Be sure to check other entry requirements and how long you can stay for.