Some excellent resource links have been shared by the Geography Teachers' Association of Victoria, on their Facebook page.
The association has an annual conference as well, which has invited a number of familiar faces from UK geography to keynote over the years. Joseph Kerski is heading there later this year for example.

One of the recent sites they shared is MapFrappe.
This has 2 maps.
Click and draw a shape or area on the left hand map, and then drag the right hand map and zoom to an area to compare it with.
Here's the M25 (roughly) if it was in Norfolk for example...