Rotterdam is the second-largest city and a municipality of the Netherlands. It is located in the province of South Holland, at the mouth of the Nieuwe Maaschannel leading into the Rhine–Meuse–Scheldt delta at the North Sea. Its history goes back to 1270, when a damwas constructed in the Rotte, after which people settled around it for safety. In 1340, Rotterdam was granted city rights by the Count of Holland.

A major logistic and economic centre, Rotterdam is Europe's largest port. It has a population of 633,471 (2017).Rotterdam is known for its Erasmus University, its riverside setting, lively cultural life and maritime heritage. The near-complete destruction of the city centre in the World War II Rotterdam Blitz has resulted in a varied architectural landscape, including sky-scrapers (an uncommon sight in other Dutch cities) designed by renowned architects such as Rem Koolhaas, Piet Blom and Ben van Berkel.

The Rhine, Meuse and Scheldt give waterway access into the heart of Western Europe, including the highly industrialized Ruhr. The extensive distribution system including rail, roads, and waterways have earned Rotterdam the nicknames "Gateway to Europe" and "Gateway to the World".

Le Havre is a port city located in the northwest of France, on the coast of the English Channel. It is an important center of maritime trade and shipbuilding. Founded in the 16th century, Le Havre quickly developed thanks to its strategic location, becoming one of the largest ports in the country. The city is known for its modern architecture, carefully planned after the destructions of World War II. In 2005, the historic center of the city was included in the UNESCO World Heritage list, and the famous architectural ensemble designed by Auguste Perret became an essential part of the city's identity.

Today, Le Havre attracts tourists with its unique atmosphere, blending old and new elements. One of its main attractions is the Notre-Dame-de-Grâce, as well as the Dunkirk Cultural Center, which hosts concerts, exhibitions, and theatrical performances. The local beaches and promenades are perfect places for walks and relaxation, while numerous restaurants offer fresh seafood dishes. Le Havre has also become an important cultural and economic center, welcoming guests not only from France but also from all over the world.

Southampton is the largest city in the ceremonial county of Hampshire, England. It is 69 miles (111 km) south-west of London and 15 miles (24 km) west north-west of Portsmouth. Southampton is a major port and the closest city to the New Forest. It lies at the northernmost point of Southampton Water at the confluence of the Rivers Test and Itchen, with the River Hamble joining to the south of the urban area. The city, which is a unitary authority, has an estimated population of 253,651. The city's name is sometimes abbreviated in writing to "So'ton" or "Soton", and a resident of Southampton is called a Sotonian.

Significant employers in the city include Southampton City Council, the University of Southampton, Solent University, Southampton Airport, Ordnance Survey, BBC South, the NHS, ABP and Carnival UK. Southampton is noted for its association with the RMS Titanic, the Spitfire and more generally in the World War II narrative as one of the departure points for D-Day, and more recently as the home port of a number of the largest cruise ships in the world. Southampton has a large shopping centre and retail park, Westquay. In 2014, the city council approved a neighbouring followup Westquay South which opened in 2016–2017.

In the 2001 census Southampton and Portsmouth were recorded as being parts of separate urban areas; however by the time of the 2011 census they had merged apolitically to become the sixth-largest built-up area in England with a population of 855,569. This built-up area is part of the metropolitan area known as South Hampshire, which is also known as Solent City, particularly in the media when discussing local governance organisational changes. With a population of over 1.5 million this makes the region one of the United Kingdom's most populous metropolitan areas.

Hamburg ; officially the Free and Hanseatic City of Hamburg is the second-largest city in Germany with a population of over 1.8 million.

One of Germany's 16 federal states, it is surrounded by Schleswig-Holstein to the north and Lower Saxony to the south. The city's metropolitan region is home to more than five million people. Hamburg lies on the River Elbe and two of its tributaries, the River Alster and the River Bille.

Rotterdam is the second-largest city and a municipality of the Netherlands. It is located in the province of South Holland, at the mouth of the Nieuwe Maaschannel leading into the Rhine–Meuse–Scheldt delta at the North Sea. Its history goes back to 1270, when a damwas constructed in the Rotte, after which people settled around it for safety. In 1340, Rotterdam was granted city rights by the Count of Holland.

A major logistic and economic centre, Rotterdam is Europe's largest port. It has a population of 633,471 (2017).Rotterdam is known for its Erasmus University, its riverside setting, lively cultural life and maritime heritage. The near-complete destruction of the city centre in the World War II Rotterdam Blitz has resulted in a varied architectural landscape, including sky-scrapers (an uncommon sight in other Dutch cities) designed by renowned architects such as Rem Koolhaas, Piet Blom and Ben van Berkel.

The Rhine, Meuse and Scheldt give waterway access into the heart of Western Europe, including the highly industrialized Ruhr. The extensive distribution system including rail, roads, and waterways have earned Rotterdam the nicknames "Gateway to Europe" and "Gateway to the World".