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Thousands of large (> 2 ha) rock slope failures affect the Neogene marine sedimentary cover rocks of Aotearoa New Zealand. These slope failures are known to damage lifeline infrastructure, entire suburbs, agricultural land, and deliver substantial volumes of fine sediment to rivers. Despite their prevalence in the landscape and potential impacts, there has been little systematic quantification of their activity, causes, and impact. This research brings together several local case-studies and regional statistical & monitoring analyses that document the causes, movement patterns, and economic and environmental impacts of such rock slope failures in New Zealand’s North Island. At the local scale, for several large landslides that have affected infrastructure and farming operations we present i) financial damage estimates, ii) movement data collected using GPS, time-lapse, and remote-sensing methods, and iii) sediment …