how many provinces does "southwestern China " cover?

when we talk about "Southwestern China ", we mean these provicnes which are located in southwestern China ;

the provinces in southwestern China are:

• Tibet Autonomous Region,
• Qinghai province,
• Sichuan province,
• Guizhou province,
• Guangxi Zhuang Autonomous Region and
• Yunnan province

Based on highlights of our tourism service focus, when we say "Southwestern China," we mean these province as listed below

• Tibet Autonomous Region,
• Qinghai province,
• Sichuan province,
• Yunnan province