Greek referendum: What's it all about?

Greece holds its much-anticipated referendum on Sunday on whether to accept the austerity demands of its international creditors.

The eurozone says it amounts to a vote on Greece's place in the euro - something fiercely denied by the Greek government.

With banks closed and capital controls in place, all signs are that it will be a very tight race.

Mark Lowen explains the background and implications of the vote, from a beach near Athens.