Sri Lanka’s last great tract of primary lowland rainforest is a UNESCO World Heritage Site protecting 64% of the island’s endemic tree species and over 20 endemic bird species found nowhere else on earth. The forest’s interior receives up to 5,000mm of rain annually, creating a perpetually mist-filtered canopy environment of exceptional botanical density. Mixed bird flocks moving through the canopy in the early morning – led by the unmistakeable Sri Lanka blue magpie – are a naturalist’s spectacle of the highest order. Guided walks with specialist naturalists are the only responsible way to access the forest interior.