Borders between Brazil and Argentina
To visit both sides of the falls, one must cross the borders between Argentina and Brazil. Right now, there is no way to cross the borders. They are closed. The government in Brazil wants to open it. The government in Argentina is not interested in doing it. They will open the borders if covid-19 cases are reduced to a safe level in Brazil. Some people say that it will be open only in Setember 2021.
Borders between Brazil and Paraguay
To enter Paraguay one needs to stamp the passport at the border and show the covid-19 PCR test. For people that visit Ciudad del Este city, they don't require anything. People usually go to Paraguay for shopping because of the duty-free markets there. There is a small waterfall called Monday falls near Puerto Franco town. One can also visit the Itaipu Dam from the Paraguayan side. In the city, there is also a handicraft market with beautiful wood carving souvenirs.
Both national parks are open.