The Thermal Valley (Chinese: 地獄谷; pinyin: Dìyù Gǔ) is a valley located on the foothill of Yangmingshan National Park in Beitou District, Taipei, Taiwan.

This makes Thermal Valley one of the sources of acidic sulfur hot spring in the area.

The formula of this mineral water contains Plaster, Alunite, Jarosite, Realgar, Sulfur, and Radium.

It was one of the eight attractions and twelve scenic spots in Taiwan during the Japanese colonial period.

[1] Thermal Valley is accessible within walking distance east from Xinbeitou Station of the Taipei Metro.