thank you for the post.
There are many others amphitheatres in low res , for exemple :
Butrint
Pula
Burnum
Salamis
Isirium (modern Aldborough)
Charterhouse on Mendips
Deva (modern Chester)
Camulodunum (modern Colchester)
Durnovaria (modern Dorchester)
Viroconium
Venta Silurum (modern Caerwent)
Grand
Mediolanum Santonum (modern Saintes)
Mainz
Trier
Xanten
Nijmegen
Arretium (modern Arezzo)
Carsulae
Ocriculum (modern Otricoli)
Rusellae
Spoletium (modern Spoleto)
Suasa
Urbs Salvia (modern Urbisaglia)
Aventicum
Caerleon
Richborough
Silchester
Cirencester
Maryborough near Penrith,
Wroxeter
Nyon