Disappearance of the cypress forests The cypress forests growing at altitudes of 1800 to 2500 meters can be seen from the Patungkuan Trail, and are classified as warm-temperate forests. Areas at this altitude have the highest humidity in Taiwan, and are swathed in fog throughout the year.
檜木黑森林不再海拔約二千五百到一千八百公尺的檜木林，位於日據越嶺古道的對關、觀高之間，屬於暖溫帶森林，這個高度是台灣島上溼度最高的地區，終年雲霧瀰漫。