The Singel Canal, also known as the Singel Canal, is one of several canals in Amsterdam, originally a moat. The Singel Canal originated in 1492 and was Amsterdam's moat in 1585; it became a canal after the expansion of Amsterdam's urban area. In addition to the Singh Canal, the commonly referred to Amsterdam canals consist of three main canals: the Gentleman Canal, the Prince Canal and the Emperor Canal. These three canals form a concentric belt around the city, called the Canal Belt. Singh Canal is strictly a canal outside the Canal Belt. However, visitors to Amsterdam, from the airport to the Central Railway Station, may be the first sight of the Singer Canal. The Singer Canal starts at IJ Bay, near Amsterdam Central Station, and ends at Mint Square, where it meets the Amsterdam River. Said to see crabs in the river. Also said: ... crabs instinctively crawl around the river, everything swallows, even pollution does not matter. When black is over, some life tries to climb over the dike and climb to the sea, these life will climb and swim, it is lucky. But unfortunately the dam is too powerful, there are not many lives to soak in freedom, even the life of the poor even the blue sea did not see. Inside and outside the dam, I hope that the crabs will be harmonious. When the crabs are squatting, it is best to stay away from the river. Keeping the distance and looking far away is beautiful.