Know that there is one road from Damascus in Syria to Medina, as we have said.1 Its length in hours [of travel] is 342. Its stages [or legs] are 28J [in theory], when calculated at usual camel speed with every stage accounting for 12 hours. The road is 684 miles, or 228 parasangs, or 57 posts (barid). A mile takes half an hour, a parasang equals three miles, a post equals four parasangs. The number of 1. SIP: 112-23; cf. HDM : 5 ff.