More than 70 entries from Auckland have already been received for the annual Mangawhai Triathlon this weekend, which will take part on a re-jigged course.
This Sunday's event, which is the first in a series of three triathlons being organised by Sport Northland over the next six weeks, is a popular event and is likely to have numbers restricted.
Sport Northland events team leader Hayley Overton says it is pleasing to see this event gaining in popularity, however numbers are limited due to the space.
"The course has been altered this year to make it more interesting and reduce congestion around the transition and finish area," she explained.
"However, we only have a limited space to work with in the transition area which means we will have to restrict entry numbers." Based at the end of Mangawhai Heads Road, the triathlon offers a swim of 500 metres or kayak of 1.5km followed by a 20km cycle and 5km run.