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The coast of California north of San Francisco contains the Northern California coastal forests (as defined by the WWF) and the southern section of the Coast Range ecoregion (as defined by the EPA). This ecoregion is dominated by redwood forest , containing the tallest and some of the oldest trees in the world.
California comes in a close second with 13 ecoregions across four biomes in the same realm. By contrast, Rhode Island is the least biodiverse with just one ecoregion—the Northeastern coastal forests —encompassing the entire state.
The tropical wet forests of North America have an average year-round temperature between 68 and 78.8 °F (26.0 °C). Thus, frost does not occur under these conditions. [2] The temperatures remain fairly uniform throughout the year; therefore there is not a change of seasons. There is also no dry season, as all months experience precipitation.
California is in the Nearctic realm. Ecoregions are listed by biome: [1] Temperate coniferous forests. Eastern Cascades forests (Eastern Cascades Slopes and Foothills)
Northern California usually refers to the state's northernmost 48 counties. The main population centers of Northern California include San Francisco Bay Area (which includes the cities of San Francisco, Oakland, and the largest city of the region, San Jose), and Sacramento (the state capital) as well as its metropolitan area.
Pacific temperate rainforests have been subject to ongoing large-scale industrial logging since the end of World War II, cutting over half of their total area. In California, only 4% of the redwoods have been protected. In Oregon and Washington, less than 10% of the original coastal rainforest area remains.
In addition, Puerto Rico contains El Yunque National Forest, the only tropical U.S. rainforest. Alaska has the most national forest land, with 21.9 million acres (8.9 million ha), followed by California (20.8 million acres, 8.4 million ha) and Idaho (20.4 million acres, 8.3 million ha).
The rainforests of the Azores (also known as cloud forests, due to the constant cloud coverage caused by orographic lift) are found in the more humid, montane areas that transition from the lower altitude laurissilva. They are generally found at altitudes ranging from 600 to 1,000 m (2,000 to 3,300 ft), and receive 2,000 to 6,000 mm (79 to 236 ...