The environmental protection system the USA, although very complex, is one of the more efficient in America. It is multifarious and comprises national parks, national forests, nature reserves, national recreation areas and many other. In Alaska, national parks cover vast areas. This is primarily due to sparse population and the abundance and variety of the wildlife. The author writes about the history of the park, its geological makeup, rivers and animal and plant life. The gold rush of the 19th century also gets a mention.