Understanding the fine scale activity and habitat use of freshwater turtles is important in determining their resource and habitat requirements. Ongoing advances in animal-borne sensors is increasing our understanding of the movement ecology of numerous taxa, however, they have rarely been deployed on freshwater turtles. The southwestern snake-necked turtle (Chelodina oblonga) is endemic to southwest Western Australia. Their populations are currently declining due to threats including urbanisation, predation, and climate change. While broad scale information on the movement patterns has recently been obtained, fine scale information is needed to enhance our understanding of how it uses its environment. This study aims to be one of the first to utilise accelerometer biologgers on freshwater turtles to determine the fine-scale activity of southwestern snake-necked turtles in riverine and wetland habitats. We are deploying activity and radio tags on a population of the species within the Canning River system, Western Australia, that includes estuarine, riverine, and off-channel wetland habitats. Turtles will be trapped on either side of the Kent St Weir (that splits the river into saline, tidal and freshwater, non-tidal habitats) to compare behaviour in relation to salinity, temperature, depth and to determine if turtles are able to move through the barrier. To explore temporal changes in behaviour, turtles will be tagged in winter, spring and summer and activity data recorded for approximately 30 days in each season. Preliminary data is revealing diel patterns in activity, depth utilisation (including breath-hold times), along with two-dimensional movements between tidal and non-tidal river and wetland habitats. Environmental predictors of these fine scale behaviours will also be modelled. The study will contribute to the future conservation of this species by understanding environmental drivers of behaviours and will also advance our knowledge of freshwater turtle behaviour more generally.