Mandarin Oriental Washington, D.C. is a luxury Postmodernist-style hotel located at 1330 Maryland Ave SW, Washington, D.C., in the United States.
 Completed in 2004, the hotel is near the National Mall and Smithsonian Institution museums, and overlooks the Tidal Basin.
 The hotel contains two restaurants, one of which (CityZen) closed permanently on December 6, 2014.
 Since its opening, the Mandarin Oriental Washington, D.C., has been AAA-rated four diamonds and Forbes Travel Guide rated four stars.
The Nam Van Lake (; Portuguese: "Lago Nam Van" ) is a man-made lake in Sé, Macau, China.
 It is one of two man made lakes in Macau.
 It is located at the southern end of Macau Peninsula.
Mandarin Oriental Hyde Park, London is a five-star hotel, located in the Knightsbridge district of London, owned and managed by Mandarin Oriental Hotel Group.
 Housed in an historic, Edwardian-style building, the hotel originally opened its doors to the public as the Hyde Park Hotel in 1902.
 Mandarin Oriental Hotel Group purchased the hotel in 1996 and conducted a complete renovation of the 198 rooms and suites, as well as a re-design of the restaurants and bar.
 Mandarin Oriental Hyde Park, London re-opened in May 2000.
Mandarin Oriental, Munich is located in Munich’s Old Town near shopping along Maximilianstrasse and the famous brewery Hofbräuhaus.
 The building that houses Mandarin Oriental, Munich was originally constructed in 1880 and served as the city’s opera house.
 In 1990, the building was converted to hotel use and was eventually purchased by Mandarin Oriental Hotel Group in 2000.
 In 2015 the hotel has undergone an extensive refurbishment of its public areas an opened the new restaurant Matsuhisa, Munich the Bar31 as well as a new lobby lounge in November 2015.
Mandarin Oriental, Bangkok is a five-star hotel in Bangkok owned in part and managed by Mandarin Oriental Hotel Group.
 Located on the banks of the Chao Phraya River, the original structure was the first hotel built in Thailand when it opened as The Oriental in 1876.
 Today, the hotel is one of two flagship properties of Mandarin Oriental Hotel Group and is known for service, which consistently places it among the world's best hotels ("see" Awards).
The Mandarin Oriental, Sanya () is a luxury resort located in Sanya City on the southeastern coast of the island of Hainan, People's Republic of China.
 The 296-room resort opened in 2009 and is managed by Mandarin Oriental Hotel Group.
 The hotel contains 10 restaurants and bars as well as the 3200 m2 Spa at Mandarin Oriental, Sanya.
The Mandarin Oriental Macau () is a luxury hotel on Avenida da Amizade in Sé, Macau, China under One Central development.
 It overlooks the Outer Harbour and Nam Van Lake, immediately to the south of the Wynn Macau hotel, and is located near a jet boat terminal.
 The hotel was rebuilt replacing an earlier hotel and was opened on 29 June 2010.
 It is described by Lonely Planet as a "refreshing alternative" to the many casino hotels of the city.
 The 435 rooms are decorated with Portuguese fabrics and teakwood furnishings.
 It is mentioned that the hotel is now often referred to as the Grand Lapa after a "sale of 50% of its interests to the Sociedade de Turismo e Diversoes de Macau, or STDM".
Mandarin Oriental, Barcelona is located on Passeig de Gràcia close to a number of Barcelona’s shopping and dining establishments as well as cultural and entertainment venues.
 The Mandarin Oriental, Barcelona opened in November 2009 and was designed by a team of Spanish architects and designers: Carlos Ferrater and Joan Trias de Bes (architecture) and Patricia Urquiola (interior design).
 The hotel’s 98 guest rooms and suites are housed in a re-developed, mid-20th Century building that was once home to a bank.
 Mandarin Oriental, Barcelona also includes The Spa at Mandarin Oriental, Barcelona and five restaurants and bars, including Moments, a Catalan restaurant headed up by Carme Ruscalleda, a Michelin starred chef.
Mandarin Oriental, Hong Kong () is a five-star hotel located on Connaught Road in Central, Hong Kong, owned and managed by Mandarin Oriental Hotel Group.
 The hotel opened its doors in 1963 as "The Mandarin".
 In 2005, the hotel spent USD 150 million to renovate its 501 guestrooms, 10 restaurants, and numerous public spaces, as well as to construct the three-storey Mandarin Spa, one of a few Forbes Five-Star spas in Hong Kong.
Mandarin Oriental, Paris is a luxury hotel in Paris.
 The 138-room hotel joined Mandarin Oriental Hotel Group's portfolio of managed hotels in June 2011.
 The hotel has 3 restaurants and bars, and a Cake Shop, all under Michelin star winning Chef Thierry Marx.
 Additional hotel features include "The Spa at Mandarin Oriental, Paris" and a private, interior courtyard garden.

Question: Mandarin Oriental Macau is a hotel that overlooks what man-made lake in Macau?
Answer: Nam Van Lake