Piles of discarded furniture and waste were found at Y Domen Fawr summit, Blaenau Gwent in the Brecon Beacons National Park.
The huge pile of fly-tipping was found just meters away from anti-littering signs.
The waste contained a range of household waste from a dartboard to old beds. It follows other cases in which old tyres, kitchen sinks and mattresses were dumped nearby.
Kristian Wilkes, who walked to the site from Manmoel Road said "it's always been a hotspot for fly-tippers"
Almost 1,000 incidents of fly-tipping were reporting to Blaenau Gwent council in 2018.
Mr Wilkes thinks the council is not doing enough and believes that patrols need to happen daily or at least a few times a week, signs will not stop it.