Scaldis > (The River Schelde, which rises in NE France, crosses
Belgium, and in the Netherlands flows into the North Sea; length
c. 270 miles)
Haina > (The River Haina)

2 And let the marsh of Estham Bruges tell,

Estham Bruges > (Bruges; Brutus's camp)

3 What colour were their waters that same day, 4 And all the moor 'twixt Elversham and Dell,

moor > marsh; flood-plain; heath Elversham and Dell > (Not identifiable)

5 With blood of Henalois which therein fell.

Henalois > (The men of Hainaut)

6 How oft that day did sad Brunchildis see 7 The green shield dyed in dolorous vermilion?

in > [with]

8 That not Scuith guiridh it might seem to be,