北上廣深

1. • Beijing, Shanghai, Guangzhou and Shenzhen (abbr. for 北京 běijīng + 上海 shànghǎi + 广州 guǎngzhōu + 深圳 shēnzhèn)

Character by character

• 北(běi)north
• 上(shàng)up
• 廣(guǎng)wide
• 深(shēn)deep