Bolivia and Brazil
Just two South American nations are landlocked: Bolivia and Paraguay.
Paraguay.
Yes, Paraguay share borders with Argentina, Bolivia and Brasil.
The Republic of Paraguay is bordered by Argentina to its southern border. Towards is northwest is Bolivia, and to the east and northeast is Brazil.
In Paraguay, Asuncion is situated on Paraguay River's left bank near Argentina's border. This city is the capital of Paraguay, and it was founded in 1536.
The two rivers that form a natural border between Paraguay and Argentina are the Paraná River and the Paraguay River. The Paraná River lies to the east and serves as a significant boundary, while the Paraguay River flows along the western side of Paraguay, separating it from Argentina. Together, these rivers define much of the border between the two countries.
Paraguay, Brazil, Uruguay, and Chile
The countries that share a border with Paraguay in South America include; Brazil, Argentina and Bolivia. These countries are all interconnected but you;d have to more specific as to what you mean by how they influence each other.
Brazil shares its longest border with Bolivia.
Uruguay Paraguay Argentina in South Border
Both are landlocked countries in their continents, each with a river as southern border.