If it is important to get your message across then you need to do what the media and other organisations have been doing for years - use an analogy that people are more familiar with!

For example, nobody knows what 20000km² looks like; but say it is an "area the size of Wales" and it suddenly becomes much clearer. (To see how commonly this analogy is used click here to see what a search on "area the size of Wales" in Google throws up!)

At SizeOfWales.co.uk a set of conversion utilities for lengths, heights, areas, volumes and weights will enable you to express your feature of interest in terms of something more familiar.