You may need a visa for Mauritius if you have a Nauruan passport
Visa options for Mauritius (2)
Visa on arrival for a maximum of 60 days
Travellers need a visa to visit Mauritius for Business or Tourism. Travellers can get a visa on arrival in Mauritius 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.