This map shows the Romney Marsh area in Roman times, the high tide levels
are shown 5 metres higher, and the river Rother(Limen) flowed across the north of the Marsh
passing Portus Lemanis(Stutfall castle) finally emerging at the sea near modern day Hythe.
Behind Hythe there is an area currently just below sea level that appears to be a lagoon, it is recorded that
the romans were extracting salt around the Dymchurch, Lydd and St Mary in the Marsh areas in the 2nd century,
probably mostly from this tidal lagoon.
Portus Lemanis is most likely to have been located in the lagoon, that implies the Roman Navy Classis Britannica(CLBR)
used the lagoon as a protected harbour for their fleet, with Stutfall Castle as its major defence. It also seems
to imply that the Saxon Shore forts protected important harbours for the CLBR so Pevensey may have been a major port.
The Rother was tidal to at least Bodiam, and the effects probably reached further upstream past Etchingham
to Tidebrook near Stonegate.
The shaded areas on the Marsh area are derived from research carried out at the University of East Anglia
The "Kent A" cadastre - page 5 - Peterson 2002
the main data shows the differing soil types on the marsh - implying land at various points.