Taken from the mills website
A playing-field is defined as being a flat, level area, surfaced to minimize injury and
completely surrounded by league approved netting to ensure safety.
M7: 46x38 meters, at least 35 obstacles
D7: 55x33 meters, at least 35 obstacles
M5: 55x20 meters, at least 25 obstacles
Obstacles will be placed a minimum of 1.5 meters off the boundary. The playing-field
boundary shall be marked clearly visible and will be placed a minimum of 1.5 meters off
the netting.