Question: Durolevum was a Roman settlement in which country, the only surviving mention of it from antiquity appears in the Antonine Itinerary, where it forms part of the Roman equivalent of Watling Street, a route in England and Wales that began as an ancient trackway first used by the Britons, mainly between the areas of modern Canterbury and St Albans using a natural ford near Westminster?

Context paragraphs:
Ancaster Roman Town: Ancaster Roman Town was a small town in the Roman province of Britannia.  It is sited on the Roman road known as the Ermine Street and is situated in the county of Lincolnshire.  Its name in Latin is unknown, although it has traditionally been identified with "Causennis" or Causennæ, a name which occurs as a town on the route of "Iter V" recorded in the Antonine Itinerary.  Rivet and Smith questioned this identification in 1979 and suggested that a more likely identification would be either the Roman settlement at Salters ford, near Grantham in Lincolnshire, or at Sapperton in Lincolnshire

Sulloniacis: Sulloniacis or Sulloniacae is the name of a place in Roman Britain which is known only from an entry in the Antonine Itinerary, a listing of routes and facilities for the cursus publicus, the official courier service of the Roman Empire.  "Iter" (Itinerary) II of the British section runs between Richborough (Portus Ritupis) and Chester (Deva), and this shows Sulloniacis on the road now known as Watling Street, nine Roman miles from St Albans (Verulamium) and 12 from London.  Sulloniacis is usually identified with Roman remains found at Brockley Hill near Edgware in the London Borough of Barnet.

Akeman Street: Akeman Street was a major Roman road in England that linked Watling Street with the Fosse Way.  Its junction with Watling Street was just north of Verulamium (near modern St Albans) and that with the Fosse Way was at Corinium Dobunnorum (now Cirencester).  Its course passes through towns and villages including Hemel Hempstead, Berkhamsted, Tring, Aylesbury, Alchester (outside modern Bicester), Chesterton, Kirtlington, Ramsden and Asthall.

Ebbsfleet River: Ebbsfleet River is a river in Kent, south-east England.  Today, it gives its name to the Ebbsfleet Valley redevelopment area, prior to that when it was known as the River Fleet it gave its name to Northfleet and Southfleet.  Its source was eight natural springs at Springhead.  In Roman times its source was the site of a Roman settlement called Vagniaci and the river was used to link Watling Street to the River Thames, in the fourteenth century it was a stopping place for pilgrims going to Canterbury.  It is mentioned in the "Anglo-Saxon Chronicle" as Ypwines fleot (version A) or Heopwines fleot (version E).  A bridge across the river at Northfleet is mentioned in 1451 and it was still tidal and used for shipping in the sixteenth century.  In the nineteenth century the river was the earliest centre in Britain for the commercial cultivation of watercress, this was started by Mr William Bradbery in 1808.  He later moved the business to West Hyde, Hertfordshire in 1820.  Following the removal of its waters in around 1901, when all its waters were used by the local water company, its dried riverbed was the subject of a botanical study by Marie Stopes.  Parts of the river can still be seen.

Old Kent Road: Old Kent Road is a major thoroughfare in South East London, England, passing through the London Borough of Southwark.  It was originally part of an ancient trackway that was paved by the Romans and used by the Anglo-Saxons who named it Wæcelinga Stræt (Watling Street).  It is now part of the A2, a major road from London to Dover.  The road was important in Roman times linking London to the coast at Richborough and Dover via Canterbury.  It was a route for pilgrims in the Middle Ages as portrayed in Chaucer's Canterbury Tales, when Old Kent Road was known as Kent Street.  The route was used by soldiers returning from the Battle of Agincourt.

St Albans: St Albans , is a city in Hertfordshire, England, and the major urban area in the City and District of St Albans.  It lies east of Hemel Hempstead and west of Hatfield, about 19 mi north-northwest of central London, 8 mi southwest of Welwyn Garden City and 11 mi south-southeast of Luton.  St Albans was the first major town on the old Roman road of Watling Street for travellers heading north, and it became the Roman city of Verulamium.  It is a historic market town and is now a dormitory town within the London commuter belt and the Greater London Built-up Area.

Watling Street: Watling Street is a route in England and Wales that began as an ancient trackway first used by the Britons, mainly between the areas of modern Canterbury and St Albans using a natural ford near Westminster.  The Romans later paved the route, which then connected the Kentish ports of Dubris (Dover), Rutupiae (Richborough), Lemanis (Lympne), and Regulbium (Reculver) to their bridge over the Thames at Londinium (London).  The route continued northwest past Verulamium (St Albans) on its way to Viroconium (Wroxeter).  The Romans considered the continuation on to Blatobulgium (Birrens) beyond Hadrian's Wall to be part of the same route, leading some scholars to call this Watling Street as well, although others restrict it to the southern leg.  Watling Street was the site of Boudica's defeat by the Romans and was later the southwestern border of the Danelaw.  In the early 19th century, the course between London and the Channel was paved and became known as the Great Dover Road: today, the route from Dover to London forms part of the A2 road.  The route from London to Wroxeter forms much of the A5 road.  At various points along the historic route, the name Watling Street remains in modern use.

Noviomagus Cantiacorum: Noviomagus, also known as Noviomagus Cantiacorum (Latin for "Noviomagus of the Kentish") to distinguish it from other places with that name, was a Roman settlement in southeastern Britain.  It was just southeast of the Thames ford near Westminster on the British Watling Street and the Thames bridge at Londinium along the Roman route.

Thorney Island (London): Thorney Island was the eyot (or small island) on the Thames, upstream of medieval London, where Westminster Abbey and the Palace of Westminster (commonly known today as the Houses of Parliament) were built.  It was formed by rivulets of the River Tyburn, which entered the Thames nearby.  In Roman times (and presumably before), Thorney Island may have been part of a natural ford where what was later called Watling Street crossed the Thames, of particular importance before the construction of London Bridge.

Durolevum: Durolevum was a Roman settlement in Britain.  The only surviving mention of it from antiquity appears in the Antonine Itinerary, where it forms part of the Roman equivalent of Watling Street, connecting Rutupiae (Richborough) to Londinium (London).  It is now thought to have been located at Ospringe in Kent, after the discovery of Roman ruins between Judd's Hill and Beacon Hill in 1931, but this remains uncertain.

Supporting paragraphs: Durolevum Watling Street
Answer: Britain