Demining Cambodia would double its usable land area.

Evidence

One of the strongest currents of American optimism flows from Thomas Jefferson’s vision of land as the most prudent investment, an investment that benefits both the individual and the nation. You can mint more money, Jefferson observed, but you cannot mint more land. Yet that credo seems less certain when one considers a nation like Cambodia, where 4 million to 7 million active mines and uncounted cluster submunitions have rendered half the country unsafe. To demine Cambodia would amount to a miraculous land-minting scheme, effectively doubling the country’s size without conquering a neighbor. — Rob Nixon, Slow Violence and the Environmentalism…, 702