Which mountain range forms Shaanxi’s southern boundary with Sichuan and Chongqing?

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The mountain range that forms Shaanxi’s southern boundary with Sichuan province and Chongqing municipality is the Daba Mountains.

These mountains, which are also sometimes referred to as the Ba Mountains, serve as a major structural complex that separates the Han River valley to the north from the Sichuan Basin to the south.12