Population and related socio-economic statistics are gathered by collection districts, aggregated to SLAs and in turn these are aggregated to statistical divisions, and then to States and Territories. SLAs are roughly equivalent to administrative shires, and often follow the same boundaries. There has been substantial re-alignment of SLA boundaries in recent years, particularly in Victoria which has made analysis of spatially dispersed data (such as agricultural statistics) difficult to compare across years.
SPECIAL LANDSCAPE AREA. areas of countywide landscape significance, defined in the Kent Structure Plan and Kent Countryside Plan. There are three SLA's in the District (1) North Kent Marshes, (2) North Downs and (3) Blean Woods.