The off-road duathlon series, which has been held at Glentress for the past 10 years, will be staged at Bowhill House and Estate, near Selkirk, this year.
It begins with a short taster event aimed at novices on Sunday, December 2, and will be followed by further events on January 27 and February 24, all starting at 12noon.
The series is this year being organised by local company, Durty Events, who are also behind the Durty Triathlon event at St. Mary's Loch each summer, and several other high-profile races across Scotland.
Promoter Paul McGreal said: "Duathlon is a close multisport relation of triathlon. It just involves a run followed by a mountain bike ride, or vice versa. Thankfully, no-one will be asked to swim - it's a bit chilly for that!
"What is promised though, is loads of fun, a bit of mud, and a few hills. The courses are designed to be challenging but achievable, safe but adventurous, and suitable for both newbies and international racers - both groups, and all in between are expected at the races.
"A mixture of trials, from wide forest roads to twisty 'singletrack' trails will be used. It's a great, local opportunity to dip your toe into the multisport world."
Entries are coming in thick and fast from across Scotland, meaning lots of visitors coming into the Borders. Entries are also very much encouraged from local runners.
"The series is deliberately 'newbie-friendly' and beginners are very welcome," Paul said. "If you've not tried duathlon before, this could be your big chance!
"The series starts with a gentle introduction - the 'short' race - anticipated winning times are 20 minutes trail run, plus 20 minutes mountain biking, on challenging but achievable routes through the beautiful Bowhill Estate.
"No special equipment is needed, a working mountain bike or hybrid with chunky tyres, plus some running shoes you don't mind getting wet and muddy!"
For more details on the Bowhill Duathlon Series, and the links for online entry, log on to the following website - www.durtyevents.com