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Guillaume has hiked thousands of miles in Malaysia, Ukraine and Lithuania. What started with a weekly walk in the hills of Penang Island looking for abandoned durian plantations and rain gauges became a passion to explore little-known national parks in Eastern Europe. When he’s not busy organising French classes and exams, or at the playground with his two kids, you can find him munching on chocolate and gazing at a lake in a remote corner of Lithuania. Or cursing in French, his native language, when he realises he’s missed a trail fork after half an hour.