canton, northeastern Switzerland. It is bordered on the north by Lake Constance (Bodensee), by the Rhine River on the northwest, and by the cantons of Sankt Gallen on the south and Zurich and Schaffhausen on the west. With an area of 383 square miles (991 square km), it is divided into three hill masses: one stretching along the lake; another inland, bounded north by the Thur River and south by its affluent, the Murg; and the third at the southern extremity of the canton, merging into the pre-Alpine zone of Mount Hornli. Frauenfeld (q.v.) is the capital
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