Amsterdam's name derives from Amstelredamme, indicative of the city's origin as a dam of the river Amstel.
Amsterdam is home to more than one hundred kilometers of canals. The three main canals are Prinsengracht, Herengracht and Keizersgracht, all 3 of which are navigable by boat. In the Middle Ages, Amsterdam was surrounded by a moat, called the Singel, which now forms the innermost ring in the city, and makes the city center a horseshoe shape. The city is also served by a seaport. It is often nicknamed the "Venice of the North," due to its division into approximately 90 islands, which are linked by more than 1,200 bridges.
Fashion brands like G-star, Gsus, BlueBlood, and fashion designers like Mart Visser, Viktor & Rolf and Frans Molenaar are based in Amsterdam.