Introduction
Elephants, gibbons, exotic birds and orangutans; sprawling forests and secluded beaches; wide crater lakes that gobble up the countryside and towering volcanoes that obscure the horizon - it's all in Sumatra.
Throw in 50 million people sharing more than 50 languages, hidden rural villages and huge urban centres with well-preserved traditions and colourful cultural codes, and you're left with an island that's strikingly beautiful and staggeringly diverse.
