Singapore is a group of 63 islands, but the majority of these islands remain uninhabited. The government of Singapore uses them for a variety of purposes, from military to industrial uses. The most popular islands are entertainment resorts like Sentosa, known for its casinos and Universal Studios. The island Pulau Ubin and Chek Jawa Wetland Nature Reserve are great for their cycling trails. The Southern Islands consist of St John's Island, Kusu Island, and Lazarus Island, famous for their spectacular, uncrowded beaches.