You need a visa for Armenia if you have an Algerian passport
Visa options for Armenia (2)
Electronic visitor visa
Travelers need a visa to visit Armenia for Business or Tourism. An Armenian eVisa is the fastest and easiest way of obtaining a visa for Armenia because travelers can submit their application and supporting documents online. Once the application is approved, travelers receive their eVisa confirmation electronically. A valid visa is required to board the flight. If the visa is expired or doesn’t match the traveler’s passport information, travelers will not be able to board their flight.
This is not offered by sherpa°.
Apply on the government site.
Visa on arrival may be available with conditions
Travelers need a visa to visit Armenia for Business or Tourism. Travelers who have a valid visa or resident card issued by EU and Schengen member states, GCC member states, USA, Australia, New Zealand, South Korea, United Kingdom, Canada, Russia, or Japan may be eligible to apply for a visa on arrival to Armenia. Travelers can get a visa on arrival in Armenia at the port of entry, such as an international airport or border crossing.
This is not offered by sherpa°.
Apply on the government site.