Generally rectangular in shape, Connecticut extends c.90 mi (145 km) from east to west and c.55 mi (90 km) from north to south. The state is divided into two roughly equal sections, usually called the eastern highland and the western highland, which are separated by the Connecticut Valley lowland. The Connecticut River, which flows through only the northern half of this lowland, veers off to the southeast at Middletown in central Connecticut. In the south along Long Island Sound is a low, rolling coastal plain. The western highland, with the Taconic Mts. and the Litchfield Hills, is more rugged than the eastern highland. A few isolated peaks in the west are over 2,000 ft (610 m) high. The Thames and the rivers emptying into it drain the eastern highland, and the Housatonic, with its chief tributary, the Naugatuck, drains the western highland. The Connecticut shore is a popular summer resort area, and the protected waters of Long Island Sound lure boating enthusiasts. Bridgeport is the largest city, with Hartford, the capital, and New Haven next in size.