Venice: Venice, Venice Lagoon, Murano, Torcello, Burano, Lido, Veneto (Borch Map)

Okay is about all I would say - it has a reasonable amount of detail but the Marco Polo Venice city map is much better.

An extremely well laid out map which is, helpfully, covered in plastic. I haven't used it yet but am sure it will prove invaluable when we go to Venice in March - I have already used it to plan our ferry journey from the airport to Murano.