The term ‘nature sports’ can be understood in different ways, depending on how the words ‘sport’ and ‘nature’ are explained. Since ‘nature’ is usually understood as ‘ungroomed’, ‘nature sports’ may be interpreted either as non-competitive practices in ungroomed nature (as discussed by Krein), with examples such as backcountry skiing, climbing or surfing; or as competitive sports in ungroomed nature. This paper argues that those ultra sports that take place in ungroomed nature, such as ultra swimming and ultra running, are better (...) candidates for being called ‘nature sports’ than those non-competitive ones suggested by Krein; and that this is also more in line with the contemporary common use of the term ‘sport’. This paper discusses these ‘ultra/nature’ sports, mainly from the point of view of their relationship to nature, the values that they offer to athletes, and their specific temporality. (shrink)