Yosemite National Park is a United States National Park spanning eastern portions of Tuolumne, Mariposa and Madera counties in the central eastern portion of California, United States. The park covers an area of 761,268 acres (3,080.74 km2)[2] and reaches across the western slopes of the Sierra Nevada mountain chain.[4] Over 3.7 million people visit Yosemite each year:[3] most spend their time in the seven square miles (18 km2) of Yosemite Valley.[5]Designated a World Heritage Site in 1984, Yosemite is internationally recognized for its spectacular granite cliffs, waterfalls, clear streams, Giant Sequoia groves, and biological diversity.[5] Almost 95% of the park is designated wilderness.[6] Although not the first designated national park, Yosemite was central to the development of the national park idea, largely owing to the work of people like Galen Clark and John Muir.

Yosemite is one of the largest and least fragmented habitat blocks in the Sierra Nevada, and the park supports a diversity ofplants and animals. The park has an elevation range from 2,127 to 13,114 feet (648 to 3,997 m) and contains five majorvegetation zones: chaparral/oak woodland, lower montane forest, upper montane forest, subalpine zone, and alpine. Of California's 7,000 plant species, about 50% occur in the Sierra Nevada and more than 20% within Yosemite. There is suitablehabitat or documentation for more than 160 rare plants in the park, with rare local geologic formations and unique soilscharacterizing the restricted ranges many of these plants occupy.

The geology of the Yosemite area is characterized by granitic rocks and remnants of older rock. About 10 million years ago, the Sierra Nevada was uplifted and then tilted to form its relatively gentle western slopes and the more dramatic eastern slopes. The uplift increased the steepness of stream and river beds, resulting in formation of deep, narrow canyons. About 1 million years ago, snow and ice accumulated, forming glaciers at the higher alpine meadows that moved down the river valleys. Ice thickness in Yosemite Valley may have reached 4,000 feet (1,200 m) during the early glacial episode. The downslope movement of the ice masses cut and sculpted the U-shaped valley that attracts so many visitors to its scenic vistas today.


The Mariposa Grove, near Yosemite's South Entrance, contains about 500 mature giant sequoias. Giant sequoias are perhaps the largest living things on Earth.
Although the oldest giant sequoias may exceed 3,000 years in age, some living specimens of the ancient bristlecone pine (found in the mountains east of Yosemite and at Great Basin National Park in Nevada, among other places) are more than 4,600 years old. 
The tallest trees are the giant sequoia's cousin—the coast redwood, which you can see at Muir Woods National Monument and Redwood National Park, among others.

"Grizzly Giant, 6000 feet"

 "California Tunnel Tree"


Four Mile Trail is a moderate to strenuous trail leading from Yosemite Valley to Glacier Point. The trail begins at the valley floor west of the Swinging Bridge recreation area, and climbs the south side 4.8 miles (7.7 km) up to Glacier Point, an elevation change of 3,200 feet (1,000 m).[1][2]
Four Mile Trail was originally constructed in 1872 and was 4 miles (6.4 km) in length. In the early 1900s the trail was reconstructed and lengthened to 4.8 miles (7.7 km), yet the original name remained. This trail is remarkable because it offers views of most of the Yosemite Valley landmarks. The trail begins at the base of the Sentinel Rock. The first four miles are full of grand views of El Capitan and Yosemite Falls, as well as the Merced River as it runs through the valley. The second half of the trail provides several good views of Half Dome andTenaya Canyon.

"Half Done"

Sota la escorça del arbre
S’amaga un cor
El cor que li dona vida
El cor que li dona amor

La escorça es gruixa i dura
La escorça el protegeix
La escorça li fa insensible, altiu e indiferent

Però la escorça es sensible
a carícies i sentiments
que si li dones amb tendresa i dolçor
cau i surt el cor
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