Ireland is known as the emerald of the Atlantic Ocean, and its capital, Dublin, is a darker shade of emerald. Dublin means "river of black water" in the Gaelic language of the original inhabitants, because the River Liffey, which flows through the city, carries peat from the Wicklow Mountains that gives the river its black color. Bordering Dublin Bay on the east coast of the island of Ireland, Dublin covers an area of more than 250 square kilometers and has a population of 1.12 million (2002).

Originally, Dublin was called Bellasacres, meaning "fenced ferry town", and in Irish, "black pond". In 140 AD, "Dublin" in the Greek scholar Ptolemy's geography has been recorded. 1949 April, Ireland's full independence, Dublin was officially designated as the capital city, became the seat of the government agencies, parliament, the Supreme Court.

Dublin is a quaint, poetic and idyllic city. Ten bridges across the River Liffey connect the north and south banks. Situated on the south bank of the river is Dublin Castle, the city's most famous ancient complex, built in the early 13th century and historically the seat of the British viceroyalty in Ireland. The Fort consists of the Genealogical Office, the Archives Tower, Holy Trinity Church and the Hall. The Genealogical Office, built in 1760, is located at the front of the fort and includes the circular bell tower and the Genealogical Heraldry Museum. The Church of the Holy Trinity, a Gothic building built in 1807 and known for its fine carvings, used to be the Royal Chapel, but nowadays serves as a place for the inauguration of the President and the reception of state guests. Leinster House was built in 1745 and is now the Houses of Parliament. The Irish Post Office is a historic granite building, where the birth of Ireland **** and the country had been announced, and on the roof for the first time raised Ireland's green, white and orange flag, every year on March 17, Ireland's National Day, where large-scale celebrations are held.

Dublin is the cultural and educational center of the country, the famous Trinity College (i.e., the University of Dublin), the Bishop of Ireland University, the National Library, museums and the Royal Society of Dublin are located here. Trinity College was founded in 1591, more than 400 years ago. The College's library is one of the largest in Ireland, with a collection of more than one million books, including ancient and medieval manuscripts and early published books, including the beautifully illustrated 8th-century Gospel of Kells, which is the most valuable. The college has more than 10 departments and 300 majors in the arts, sciences, music, education, and theology, with more than 5,000 students. The National Museum houses the Hall of Ancient Ireland, the Hall of Art, the Hall of Industry and the Hall of Natural History, with a large collection of ancient artifacts, including gold ornaments from the Bronze Age. The National Gallery contains an extremely rich collection of famous paintings representing all schools of European painting, including a variety of portraits, drawings, watercolors and pocket paintings. Dublin is also the birthplace of the famous dramatist George Bernard Shaw, playwright Richard Brinsley Sherry, playwright and poet Oscar Wilde, and novelist James Joyce.

Dublin is Ireland's largest port, accounting for half of the country's total foreign trade in imports and exports, with 5,000 ships leaving the port each year. Dublin is also Ireland's largest manufacturing city, with industries such as brewing, clothing, textiles, chemicals, large-scale machine building, automobiles and metallurgy. In addition, Dublin is a nationally important financial center. The famous Jonah Corporation was born in the University of Dublin in 1991. This company, which develops software as the main body, has gained rapid development in the past ten years, and world-renowned large companies such as Motorola, Financial Times, Boeing and so on are using the products of Jonah's company. It typifies Ireland's economic success.

Phoenix Park, on the northwest outskirts of Dublin City, is one of Europe's largest and most beautiful city parks, originally a royal deer park, covering 808 hectares, with a menagerie built in 1830 and famous for breeding lions. The National Botanical Garden in Glasnivon covers an area of 50 hectares and contains a large number of valuable plants and many houses of the inhabitants of the Alpine region. In addition, there are many 18th-century Georgian buildings around the Place de la Morne Rienne.