Amsterdam, Holland is located in Western Europe and surrounded by the North Sea, Belgium and Germany. About 25% of the country is below sea level and is protected by 3,000 km of dams. The capital and largest city is Amsterdam, with a population of 1.5 million. The city is known for its excellent museums like the Van Gong Museum and Anne Frank House. Education is compulsory from ages 5 to 16 and most children start school at age 4. The Dutch enjoy leisure time with friends and relaxing activities like golf, gardening and watching TV. Popular sports include football, hockey, korfball, sailing, rowing and biking, which has established annual bicycle races.