In ancient history, five trade routes shaped this history and played an important role in it: the Silk Road, the Incense Road or the Way of Frankincense, the Amber Road, the Way of Horses and Tea, and the Trans-Saharan Highway. www.newageislam.com/islamic-history/ibrahim-al-othaimin/arabian-peninsula--a-bridge-of-communication-among-the-nations-of-the-world/d/117546