• Portland
  • Lighthouse

Portland (/ˈpɔːrtlənd/, PORT-lənd) is a port city in the Pacific Northwest and the largest city in the U.S. state of Oregon. Situated at the confluence of the Willamette and Columbia rivers, Portland is the county seat of Multnomah County, the most populous county in Oregon. As of 2020, Portland had a population of 652,503, making it the 26th-most populated city in the United States, the sixth-most populous on the West Coast, and the second-most populous in the Pacific Northwest, after Seattle. Approximately 2.5 million people live in the Portland metropolitan statistical area (MSA), making it the 25th most populous in the United States. About half of Oregon's population resides within the Portland metropolitan area.

Named after Portland, Maine, the Oregon settlement began to be populated in the 1840s, near the end of the Oregon Trail. Its water access provided convenient transportation of goods, and the timber industry was a major force in the city's early economy. At the turn of the 20th century, the city had a reputation as one of the most dangerous port cities in the world, a hub for organized crime and racketeering. After the city's economy experienced an industrial boom during World War II, its hard-edged reputation began to dissipate. Beginning in the 1960s, Portland became noted for its growing liberal and progressive political values, earning it a reputation as a bastion of counter-culture.

Lighthouse is a high tower-shaped building, lighting equipment should be installed in the tower, the location should be prominent, and pay attention to its specific architectural shape, easy for ships to distinguish, and become one of the highest points of the port. As the surface of the earth is curved, the tower must have sufficient height so that the light can be seen by long-distance ships, with a general line-of-sight distance of 15-25 nautical miles, but the light should not be too high so as not to be obscured by high clouds. According to the size and location of the lighthouse, the lighthouse can be guarded or unguarded, and important lighthouses should be guarded. ...
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