Language: English, with a trilingual abstract in English, German and French in volume 28
The first systematic speleological investigations in the Cambodian province of Siem Reap (Phnom Kulen National Park). New longest cave of Cambodia, La Ang Khchal (1,960 m long) near the Thai border in Battambang province. Altogether 8.1 km of cave passages from 54 caves are presented in detail.