The silk road started from Chang’an (now Xian) in the east and ended at the Mediterranean in the west.
The Silk Road connected China with the Iranian world, specifically the city of Samarkand (in today’s Uzbekistan) and the surrounding communities.
Silk Road didn’t connect China and Rome. At least there was no direct traffic during the years of the Roman Empire that we know of. Romans didn’t exchange their gold coins directly for Chinese silk.