The Trail CTR / Viver Santarém is a trail running event scheduled for September 13, 2026, in Santarém, at the Santarém Aquatic Complex. The event features competitive races including a 31 km Trail, a 19 km Trail Sprint, and a 12 km Mini-Trail, along with a 10 km Walk. Participants must be over 18 years old for the Trail and Trail Sprint. The Mini-Trail and Walk are open to all ages, though individuals under 16 are advised not to participate. This event is part of three circuits: the National Trail Circuit (ATRP), the Regional Trail Circuit (AAS), and the Ribatejo Trail Circuit (CTR). A new addition is the Kids Race CTR / McDonalds, a free race for children with age-appropriate distances, taking place both inside and outside the aquatic complex. The event aims to blend competition with family-friendly activities and provides all participants with access to the aquatic complex.