I own land that has a mountain creek and also a mountain river flowing through it. The creek joins the river on my land. Quite often people fishing will walk straight past me and - ignoring the no trespassing signs - jump over my fence and head to the river. When I object they tell me that I can't stop them and that they are not trespassing as long as they are below the floodline. I often reply that that that only applies to navigable rivers - but I have no real idea and am only saying that to annoy them. Now the creek is only 2 metres wide and less than gumboot depth [0.30m] at normal flow you couldn't use any vessel and its not even deep or big enough to swim in. The river is approx. 15 metres wide and has a depth of .5 to 2 metres you couldn't use a boat in it but it is big enough for a canoe. Generally I don't stop canoeists but prefer it if they remain in the river and don't land on my property. My question is, 'Can people walk across my land to access the river?' Can they use the creek and walk down it to access the river? Can they ignore my fences and "No Trespassing" signs? I have no real idea where I stand with regards to property law, or what to say to them that would show them that they are incorrect [if indeed they are].