Natural Tourism Resources（自然旅游资源）
1）Grand Canyon National Park（大峡谷国家公园）
Grand Canyon National Park is the United States'15th oldest national park.Named a UNESCO World Heritage Site in 1979，the park is located in Arizona.The park's central feature is the Grand Canyon，a gorge of the Colorado River，which is often considered one of the Seven Natural Wonders of the World.The park covers 1217262 acres of unincorporated area in Coconino and Mohave counties.
大峡谷国家公园是美国第15古老的国家公园。该公园位于美国亚利桑那州，1979年被联合国教科文组织列为世界遗产。该公园的特色是科罗拉多河大峡谷，是世界七大自然奇观之一。
2）Niagara Falls（尼亚加拉大瀑布）
Niagara Falls is the collective name for three waterfalls that straddle the international border between Canada and the United States；more specifically，between the province of Ontario and the state of New York.They form the southern end of the Niagara Gorge.
From largest to smallest，the three waterfalls are the Horseshoe Falls，the American Falls and the Bridal Veil Falls.The Horseshoe Falls lie mostly on the Canadian side and the American Falls entirely on the American side，separated by Goat Island.The smaller Bridal Veil Falls are also located on the American side，separate from the other waterfalls by Luna Island.The international boundary line was originally drawn through Horseshoe Falls in 1819，but the boundary has long been in dispute due to natural erosion and construction.
Located on the Niagara River，which drains Lake Erie into Lake Ontario，the combined falls form the highest flow rate of any waterfall in the world，with a vertical drop of more than 50 m.Horseshoe Falls is the most powerful waterfal lin North America，as measured by vertical height and also by flow rate.The falls are located 27 km north-northwest of Buffalo，New York and 121 km south-southeast of Toronto，between the twin cities of Niagara Falls，Ontario，and Niagara Falls，New York.
While not exceptionally high，the Niagara Falls is very wide.The Niagara Falls is renowned both for their beauty and as a valuable source of hydroelectric power.
尼亚加拉瀑布横跨加拿大和美国之间的国界，是三个瀑布的总称：马蹄瀑布，美国瀑布和新娘面纱瀑布。马蹄瀑布主要位于加拿大一侧，美国瀑布完全位于美国一侧，被山羊岛隔开。较小的新娘面纱瀑布也位于美国一侧，与其他瀑布相隔月神岛。
瀑布位于尼亚加拉河上，是世界上流量最大的瀑布，垂直落差超过50米。以垂直高度和流速来衡量，马蹄瀑布是北美最壮观的瀑布。尼亚加拉瀑布虽然不是特别高，但是很宽，以其美丽和宝贵的水力发电资源而闻名。
3）Yellowstone National Park（黄石国家公园）
Yellowstone National Park is a national park located primarily in the U.S.state of Wyoming，although it also extends into Montana and Idaho.It was established by the U.S.Congress and signed into law by President Ulysses S.Grant on March 1，1872.Yellowstone，widely held to be the first national park in the world，is known for its wildlife and its many geothermal features.It has many types of ecosystems，but the subalpine forest is most abundant.It is part of the South Centra lRockies forests ecoregion.Native Americans have lived in the Yellowstone region for at least 11000 years.Hundreds of structures have been built and are protected for their architectural and historical significance，and researchers have examined more than 1000 archaeological sites.
Yellowstone National Park spans an area of 8983 km2，comprising lakes，canyons，rivers and mountain ranges.Yellowstone Lake is one of the largest high-elevation lakes in North America and is centered over the Yellowstone Caldera，the largest super volcano on the continent.The caldera is considered an active volcano.It has erupted with tremendous force severa ltimes in the last two million years.Half of the world's geothermal features are in Yellowstone，fueled by this ongoing volcanism.Lava flows and rocks from volcanic eruptions cover most of the land area of Yellowstone.The park is the centerpiece of the Greater Yellowstone Ecosystem，the largest remaining nearlyintact ecosystem in the Earth's northern temperate zone.
Hundreds of species of mammals，birds，fish and reptiles have been documented，including several that are either endangered or threatened.The vast forests and grasslands also include unique species of plants.Yellowstone Park is the largest and most famous megafauna location in the Continental United States.Forest fires occur in the park each year.Yellowstone has numerous recreational opportunities，including hiking，camping，boating，fishing and sightseeing.Paved roads provide close access to the major geothermal areas as well as some of the lakes and waterfalls.During the winter，visitors often access the park by way of guided tours that use either snow coaches or snowmobiles.(https://www.daowen.com)
黄石国家公园主要位于美国怀俄明州，并延伸到蒙大拿州和爱达荷州。黄石国家公园是世界上第一个国家公园，以其野生动物和许多地热特征而闻名。它有许多类型的生态系统，其中亚高山森林最为丰富。美洲原住民已经在黄石地区生活了至少11000年。数百座建筑因其建筑和历史意义而被保护。
黄石国家公园占地8983平方千米，由湖泊、峡谷、河流和山脉组成。黄石湖是北美最大的高海拔湖泊之一，位于北美洲最大的超级火山——黄石火山口的中心，这是一座活火山，在过去的两百万年里，它以巨大的力量喷发了好几次。世界上一半的地热资源都在黄石国家公园，火山喷发产生的熔岩流和岩石覆盖了黄石公园的大部分陆地区域。该公园是大黄石生态系统的中心，大黄石生态系统是地球北温带现存的最大的完整的生态系统。这里有数百种哺乳动物、鸟类、鱼类和爬行动物，其中包括一些濒临灭绝或受到威胁的物种。黄石公园是北美洲最大、最著名的巨型动物保护区。黄石公园有许多娱乐项目，包括徒步旅行、露营、划船、钓鱼和观光等。
4）Big Basin Redwoods State Park（大盆地红杉州立公园）
Big Basin Redwoods State Park is a state park in the U.S.state of California，located in Santa Cruz County，about 36 km northwest of Santa Cruz.The park contains almost all of the Waddell Creek watershed，which was formed by the seismic uplift of its rim，and the erosion of its center by the many streams in its bowl-shaped depression.Big Basin is California's oldest State Park，established in 1902，earning its designation as a California Historical Landmark.Its original 15 km2have been increased over the years to over 73 km2.It is part of the Northern California coastal forests ecoregion and is home to the largest continuous stand of ancient coast redwoods south of San Francisco.It contains 44 km2of old-growth forest as well as recovering redwood forest，with mixed conifer，oaks，chaparral and riparian habitats.Elevations in the park vary from sea level to over 600 m.The climate ranges from foggy and damp near the ocean to sunny，warm ridge tops.
The park has over 130 km of trails.Some of these trails link Big Basin to Castle Rock State Park and the eastern reaches of the Santa Cruz range.The Skyline-to-the-Sea Trail threads its way through the park along Waddell Creek to Waddell Beach and the adjacent Theodore J.Hoover Natural Preserve，a freshwater marsh.The park has a large number of waterfalls，a wide variety of environments（from lush canyon bottoms to sparse chaparral-covered slopes），many animals（deer，raccoons，an occasional bobcat）and abundant bird life—including Steller's jays，egrets，herons and acorn woodpeckers.
大盆地红杉州立公园是美国加利福尼亚州的一个州立公园，位于圣克鲁斯县，在圣克鲁斯西北约36千米处。大盆地公园是加州最古老的州立公园，建于1902年，为加州历史地标。它是北加州海岸森林生态区的一部分，是旧金山南部最大的连续古老海岸红杉的家园。它包括44平方千米的原始森林和正在恢复的红杉森林，还有针叶树、橡树、灌木丛等。
公园的步道长度超过130千米。公园内有大量的瀑布，有多种多样的环境（从郁郁葱葱的峡谷底部到稀疏的灌木覆盖的山坡），有许多动物和鸟类，如鹿、浣熊、山猫、虎头松鸦、白鹭、苍鹭和橡子啄木鸟。
5）Hawaii Volcanoes National Park（夏威夷火山国家公园）
Hawaii is the 50th and most recent U.S.state to join the United States.Hawaii is the only U.S.state located in Oceania and the only one composed entirely of islands.Hawaii is the only U.S.state not located in the America.The state encompasses nearly the entire volcanic Hawaiian archipelago，which comprises hundreds of islands spread over 2413 kilometers.Hawaii's diverse natural scenery，warm tropical climate，abundance of public beaches，oceanic surroundings，and active volcanoes make it a popular destination for tourists，surfers，biologists，and volcanologists.Because of its central location in the Pacific and 19th-century labor migration，Hawaii's culture is strongly influenced by North American and Asian cultures，in addition to its indigenous Hawaiian culture.Hawaii has over a million permanent residents，along with many visitors and U.S.military personnel.Its capital is Honolulu on the island of O'ahu.
Hawaii Volcanoes National Park，established in 1916，is a United States National Park located in the U.S.State of Hawaii，on the island of Hawaii.It encompasses two active volcanoes：Kilauea，one of the world's most active volcanoes，and Mauna Loa，the world's most massive subaerial volcano.The park gives scientists insight into the birth of the Hawaiian Islands and ongoing studies into the processes of vulcanism.For visitors，the park offers dramatic volcanic landscapes as well as glimpses of rare flora and fauna.
In recognition of its outstanding natural values，Hawaii Volcanoes National Park was designated as an International Biosphere Reserve in 1980 and a World Heritage Site in 1987.In 2000 the name recommended to be changed by the Hawaiian National Park Language Correction Act of 2000 observing the Hawaiian spelling，but that bill died.In 2012 the Hawai i Volcanoes National Park was honored on the 14th quarter of the America the Beautiful Quarters.
夏威夷是美国第50个、也是最近一个加入美国的州，是美国唯一一个位于大洋洲的州，是唯一一个不在美洲的州，也是唯一一个完全由岛屿组成的州。夏威夷州几乎囊括了整个火山群岛，由数百个岛屿组成，绵延2413千米。夏威夷多样的自然风光、温暖的热带气候、丰富的公共海滩、海洋环境和活火山使它成为游客、冲浪者、生物学家和火山学家到访的热门目的地。首都是瓦胡岛上的火奴鲁鲁。
夏威夷火山国家公园位于美国夏威夷州的夏威夷岛上。它包括两座活火山：基拉韦厄火山是世界上最活跃的火山之一；冒纳罗亚火山是世界上最大的陆地火山。
夏威夷火山国家公园于1980年被纳入国际生物圈保护区，并于1987年被列入世界遗产。