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.
Bolivia and Brazil
Paraguay.
Paraguay and Bolivia are both countries in South America. Bolivia is in the Andes on the northwest border of Paraguay. Paraguay is southeast of Bolivia, and is landlocked between Brazil and Argentina, which separates Paraguay and Uruguay.
French Guayana, Suriname, Guyana, Venezuela, Colombia, Peru, Bolivia, Paraguay, Argentina and Uruguay
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.
Paraguay, Brazil, Uruguay, and Chile
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.
10 countries border Brazil. In fact every country in South America except Chile and Ecuador share a border with the continents largest country.
The two South American countries that do not share a border are Chile and Paraguay. Chile is located along the western edge of the continent, bordered by the Pacific Ocean, while Paraguay is landlocked and situated more centrally, surrounded by Argentina, Brazil, and Bolivia. Their geographic positions keep them separated by Argentina.
Uruguay Paraguay Argentina in South Border