Fill in the blanks

Question

Rio Grande River - forms the most of Texas's ____ boundary
Red River - acts as part of the boundary between ____ and ____
Sabine River - helps form the boundary between _____ and ____

Answer 1

Rio Grande River - forms the most of Texas's southern boundary
Red River - acts as part of the boundary between Texas and Oklahoma
Sabine River - helps form the boundary between Texas and Louisiana