Connecticut | Flag, Facts, Maps, & Points Of Interest | Britannica

Relief and drainage

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Connecticut covers the southern portion of the New England section of the Appalachian Mountain system. It contains three major regions: the Western Upland, the Central Lowland (Connecticut River valley), and the Eastern Upland. The northern part of the Western Upland—a southern extension of the Berkshire Hills—contains the highest elevation in the state, 2,380 feet (725 meters), on the southern slope of Mount Frissell in the northwest corner. It is drained by one major river, the Housatonic, and numerous tributaries. The state is dotted with lakes, the largest of which, Lake Candlewood, lies north of Danbury in the western part of the state and covers 8.5 square miles (22 square km). It was created in 1929 by impounding the Rocky River.

The Central Lowland is different in character from the other two regions, being a downfaulted block of land approximately 20 miles (30 km) wide at the Massachusetts border and narrowing as it progresses toward the sea, which it meets at New Haven. It is filled with sandstone and shale. Periodic volcanic activity some 150–200 million years ago pushed immense quantities of molten rock to the surface and produced the igneous deposits of the central valley. These layers of sandstones and traprock have been faulted, broken, and tipped so that there are numerous small ridges, some reaching as high as 1,000 feet (300 meters) above their valleys. The Connecticut River, the state’s longest, runs southward through the lowland to empty into Long Island Sound. The Connecticut and other rivers in the region have eroded the soft sandstones into broad valleys.

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The Eastern Upland resembles the Western in being a hilly region drained by numerous rivers. Their valleys come together to form the Thames River, which reaches Long Island Sound at New London. Elevations in this area rarely reach above 1,300 feet (400 meters). In both uplands the hilltops tend to be level and have been cleared for agriculture.