Knowing if you're looking for river names or administrative borders would help me decode the exact string for you.

: Likely refers to territories like T oulouse, A riege, or A gout.

: In French schools, these guides help students memorize the complex bordering departments of the Haute-Garonne (Tarn, Aude, Ariège, etc.) or the flow of the Garonne river and its tributaries.

While these types of "phrase-guides" (often called moyens mnémotechniques ) are common in French education, this specific one serves as a memory aid for the that converge in the southwest: