Khao Sok is a rainforest that is partly evergreen and partly tropical, with a great diversity of plants and wildlife. It is one of the few bigger national parks in the country that is relatively easy to access by public services from nearby Phuket, Krabi, Khao Lak, Surat Thani, and Ao Nang (Railey Beach). The main attractions of the park are iconic limestone hills, waterfalls accessible by hiking through the lush jungle, raft houses spread over Khao Sok lake, caves, and the popular Sok River.
Caves and their features form when rainwater follows the cracks or joints in the rock material, usually limestone or dolomite. The rainwater combined with carbon dioxide forms a weak acid called carbonic acid. This weak acid once in contact with the limestone begins to dissolve the limestone.
