Scientists discover East Asia's tallest tree in Taiwan's forests

The 'Heaven Sword' of Taiwan: How scientists found East Asia's tallest known tree hidden in ancient forests

For centuries, a towering natural wonder stood unnoticed in the remote mountains of Taiwan. Hidden deep within rugged forests and shielded by challenging terrain, this colossal tree avoided scientific recognition despite its immense size. Recently, researchers uncovered and measured what is now recognized as the tallest known tree in East Asia.

Nicknamed the "Heaven Sword of the Daan River," this giant Taiwania cryptomerioides tree stands at an astonishing height of 84.1 meters—taller than most urban skyscrapers. The discovery was the result of years of meticulous scientific effort, combining advanced LiDAR scanning technology, ground surveys, expert climbers, and ecological studies.

The journey to locate this extraordinary tree began in 2014, led by researchers from Taiwan's Forestry Research Institute, National Cheng Kung University, and the Taiwan Champion Trees project. Using airborne Light Detection and Ranging (LiDAR) technology, scientists created three-dimensional maps of Taiwan’s forests to identify potential giant trees. This technique revealed hundreds of trees exceeding 65 meters in height, including the tallest specimen near the upper reaches of the Daan River. Confirming its existence required a challenging expedition involving mountaineers, ecologists, geologists, remote sensing experts, and arborists.

Once the team reached the tree, precise measurements showed it to be 84.1 meters tall with a circumference of approximately 8.5 meters. The researchers documented their efforts in a study titled *The journey of finding the tallest tree in Formosa Taiwan,* describing their mission as a long-term endeavor to locate and record Taiwan's remaining giant trees.

The Heaven Sword tree belongs to Taiwania cryptomerioides, an ancient conifer species often referred to as Taiwania cypress. This species is considered a living relic of ancient forests that once covered vast areas of East Asia. Researchers estimate the tree to be nearly 1,000 years old, towering above surrounding vegetation and forming part of a unique old-growth ecosystem that supports diverse wildlife, including plants, insects, fungi, birds, and other animals.

Taiwan’s mountainous regions are among the few places on Earth capable of supporting trees that exceed 70 meters in height. Earlier surveys identified over 900 giant trees across the island, underscoring Taiwan’s remarkable forest diversity and its role as a hub for large old-growth trees in East Asia.

Beyond its record-breaking stature, the discovery of the Heaven Sword tree holds significant scientific value. Giant trees like this one play a crucial role in storing carbon, stabilizing soil, regulating local weather, and creating habitats that sustain biodiversity. Old-growth forests containing such trees also provide invaluable insights into historical climates and ecological data spanning decades.

The researchers emphasized the importance of modern technology, such as airborne LiDAR, in uncovering remote natural wonders that might otherwise remain hidden. The Heaven Sword tree serves as a reminder that even in the twenty-first century, there are still extraordinary discoveries waiting to be made in the natural world.