An interesting twist on an old cliché has been launched at the National Botanic Garden of Wales. In the UK the size of Wales has long been recognised as a useful measure of any disaster area (earthquakes, combat zones and the classic deforestation). Now there’s a new initiative trying to measure something positive in terms of the size of Wales.

Maint Cymru / Size of Wales aims to protect a region of African rainforest equivalent to the size of Wales. Current projects are a mix of conservation and tree-planting schemes.

You can follow @sizeofwales on Twitter. If you’ve got a new disaster or conservation project you’d like to convert into the size of Wales you can try this useful converter which also works with other units like the length of a London Bus and the weight of an African Elephant.