The Roman settlement at Wareham (Dorset, UK) underlies the modern town. Although no Roman roads are apparent, communication by water probably existed with the port at Hamworthy, and the River Frome may have been navigable in Roman times as far as Durnovaria (Dorchester). edited
Oups, I had it prepared... Yes, that's the source. I added the 7 Philip coins from that hoard being auctioned soon...