Audio slideshow: Across the two Sudans

Border clashes and rows about oil wealth cloud the relationship between South Sudan and Sudan eight months after the south seceded, with some fearing a new outbreak of open warfare.

One man with a rare insight into the two countries is photographer Tim McKulka. He spent five years travelling to every state in the united Sudan - then Africa's biggest country - to produce a book We'll Make Our Homes Here: Sudan at the Referendum, which will soon be available for free on iTunes.

He explains why he decided to undertake such an ambitious project.

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Photography by Tim McKulka, interview by James Copnall. Slideshow production by Emma Lynch. Publication date 13 March 2012.

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