This is easily accessed by car and still almost in town - there are numerous steps down to the spring, but may be better access upstream. The bit to swim in is only a few hundred metres long and was pretty crowded when we were there - we had to push a bit to get over the small but crowded weir. That said it was a good refresher on a hot day and with the slight current nice to float down a short distance and walk or swim back...In any event Katherine is well worth using as a base to experience some of the amazing diversity of the NT
(NB. Tourist Info staff in Katherine were as helpful as any I've used anywhere)
BUT the hot springs at BITTER SPRINGS - unfortunate name - is wider and deeper and pretty long if you are feeling adventurous. It's also more tropical looking, and even though there were plenty of people in the water when we were there it still felt spacious and pretty peaceful - Bitter Springs is about 100km sth of Katherine on the Stuart Highway. There are a number of pools and springs thereabouts. To get to Bitter Springs, as you enter Mataranka, turn left at the statue of the Aboriginal man on horseback and follow the signs.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC