As tensions between the US and Canada rise, a tiny puffin-filled island has become emblematic of a larger conflict about where one nation ends and another begins.

With up to three billion people expected to be displaced by climate change by 2100, does there need to be a shift in the way we think about national borders, asks Gaia Vince?

Despite having a population of just 2,400, Vevčani has attempted to declare independence from two different countries over the last five decades.

Pheasant Island, located between France and Spain, bizarrely changes countries twice a year. But why?

Perhaps the world's most complicated boundary, a narrow bike trail offers a window into a region that has been the battleground of Europe and is where culture and geography intersect.

Without social media or mobile phones, estranged family members exchange recorded video messages on flash drives, sent by post.

View these frontiers as inconveniences and you won’t be disappointed. But view them for what they are – magical points on the atlas – and the possibilities are boundless.

Every night, for a brief moment, the conflicted countries of India and Pakistan are unified in an epic and intricate dance-off.