The Welsh Trail Running Championships will take place within the Royal Welsh Trail Running Festival on Sunday.
The event has taken over 1,000 entries and is incorporated into the Royal Welsh Spring Festival in Builth Wells. The Championships will take place within the Half Marathon race which will also host the inaugural Welsh Inter-Regional Trail Running Championships.
A 10k Trail Race, childrens races over 1500m and 3000m and a toddler dash over 600m will also feature.
The leading athletes in the men's championships come from the Regional teams and include Paul Graham, Daniel Bodman, Matthew Evans and Peter Ryder Running for South Wales, Tomos Roberts from the North and West Wales Trail Champion Dylan Lewis.
Leading ladies in the Inter-Regional Championships include Emily Lagomarsino from the South, Elliw Haf from the North, Nerys Jones from the West and Niki Morgan from the East.
The Royal Welsh Spring Fair is a celebration of rural life with entertainment, workshops, livestock, trade stands and a food and drink quarter.