Regulation 5.4.7 describes the event area.

The event area must measure not less than 40m x 30m and have a non-slip surface, to the satisfaction of the judge on the day. The ring must be demarcated by a rope or fence which must be off the ground on all 4 sides with two separate gateways provided through which the dogs are to enter and exit. The integrity of the ring-rope must be maintained through the duration of each class. Event organisers may apply to the NZKC Agility Committee for an exemption to the minimum ring size should the physical characteristics of their venue so require.

Further, the Assembly Area is defined as:
An assembly area will be set up along one whole side (or end) of each ring. The assembly area must be 3-5m wide, and roped or fenced off and will be used to accommodate the dog which has just run the course as well as the next dog to start. Food and toys will be permitted in the assembly area. A dog must be on lead when it enters the assembly area prior to its run and must also be on lead prior to exiting the assembly area at the completion of its run. It is the responsibility of the Event management to ensure that leads are available to the handler at the completion of their run.

The following diagram shows the ring layout as described in the regulation