Located roughly ninety minutes west of the Cambodian border, this sprawling reserve is home to some of Thailand’s most vulnerable indigenous species, including Siamese crocodiles, dholes, Asian elephants, and lar gibbons. While birds, reptiles, and mammals can be encountered in abundance throughout the park, Pang Sida is most famous for its invertebrate species, with hundreds of colorful butterfly varieties thriving along the park’s rivers and streams. For a glimpse of one of the park’s most marvelous natural sites, take a leisurely stroll just one mile north of the reserve’s headquarters to find Pang Sida waterfall, a free-flowing cascade framed by brilliant green vegetation.