Heron's Head Park (formerly known as Pier 98) is a 24-acre restored wetland, that is owned and operated by the Port of San Francisco and situated at the base of the Hunters Point Power Plant. Heron's Head is a unique environment in that it is built on landfill, but is now a thriving marsh that is maintained primarily by youth and community volunteers. More than 1,200 student volunteers serve as primary caretakers of the park each year. They help to plant native plant species, weed non-natives, and clean and maintain the wild areas of the park. Heron's Head Park supports over 78 species of birds annually, and is an important rest stop for migratory birds along the Pacific Flyway.