By Hilary Andersson
BBC Africa Correspondent, Niger
Slavery continues to blight the lives of many millions around the world. Although officially abolished in some countries two centuries ago, people trafficking, bonded labour and child labour still exist.
There are some places on earth that few outsiders visit or know about, vast empty sections of the earth where time has stood still for centuries.
Niger is one of those places. It is a country that you can drive through for hours without seeing a soul.
A nation of vast, barren and windswept landscapes, a country of people who live almost entirely off cattle, and off the labour of human slaves.
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