Thailand is divided into 76 changwat (provinces), which are grouped into five groups of provinces. Those groups are named after their direction: north, north-east, central, east and south. The provinces are subdivided into 795 amphoe (districts) and 81 king amphoe (minor districts). Further subdivision levels are tambon (communes or sub-districts) and mubaan (villages). We have listed changwat (provinces) only if we know of subterranean sights.
Kanchanaburi Province
Dr. Bhol Klipbua Mine Tunnel
Erawan Falls
Tham Krasae
Tham Lawa
Tham Phra That
Pilog Mine
Sai Yok Noi Waterfall
Sri Nakarin Dam
Tham Than Lot
Krabi Province
Tham Khao Mai Khew
Tham Khlang
Tham Phet
Tham Phra Nang
Tham Phra Nang Nai
Sa Morakot
Wat Tham Sua
The Grotto
Tham Pya Nak (Viking Cave)
Phang-nga Province
James Bond Rock
Tham Paya Nakarat
Tham Phung Chang
Tham Sam
Tham Suwan Kuha
Wat Tham Tapan
Satun Province
Tham Chet Khot
Tham Chorakhe
Tham Lot Puyu
Phu Pha Petch Cave
Prasat Hin Phan Yot
Tham Le Stegodon
Tham Urai Thong
Namtok Wang Sai Thong
Songkhla Province
Khao Chang Lon Cave
Khao Nam Khang Historical Tunnel
Khao Rup Chang Cave Temple
Wat Tham Talot
Provinces of Thailand - Wikipedia