Examples of some of the physical factors you need to be aware of:

• Scale
• Location, climate, contour, topography, aspect
• Soil type and fertility (including past fertiliser history)
• Drainage
• Pasture species
• Water supply
• Contaminants and Residues
• Fences and subdivision
• Quality and presence of improvements - including yards, loading facilities, hay & implement cover
• Weeds and Pests? with note of any regional issues (eg rats tail, groundsel etc)
• Ticks
• Past production parameters achieved including carrying capacity and performance
• Potential for improvements and value adding

So before you make a decision to buy a rural property ensure you have checked out all of the above in detail. If you are unsure then get some professional help