Lava Tree State Monument is a public park located 2.7 miles southeast of Pāhoa in the Puna District on the island of Hawaii. It preserves lava molds of the tree trunks that were formed when a lava flow swept through a forested area in 1790. The lava covered the trees from bottom to top. As the lava drained away and the moisture inside the trees cooled the lava, a hard exterior shell was formed. Many of the trees are covered in moss, others have fallen to the ground and others remain standing for years as black charred skeletons.