The Caves of Northern Thailand covers the provinces of Chiang Mai, Chiang Rai, Lampang, Lamphun, Mae Hong Son, Nan, Phayao, Phrae, Sukhothai and Uttaradit. This region has Thailand's deepest caves and many of the longest caves. Over 1,150 caves, rock shelters, stream sinks, resurgences and other sites of speleological interest are fully detailed, supported by 233 surveys and a bibliography with over 500 references.