Penrith and The Border (UK Parliament constituency) includes part of the English border with Scotland. The neighbouring constituency of Hexham (together with Berwick-upon-Tweed) also takes in the border area. The name stems from the fact that when the constituency was first created it consisted of the Penrith Rural and Urban Districts, the Border Rural District and also the Alston with Garrigill Rural District. A heavily undulating, mostly farmed terrain dotted by market towns and historic villages, with wooded mountainsides and heath-covered tops, the constituency is focused on the Eden Valley between the Pennines and the Lake District, with the vale of the River Irthing above Carlisle. In
Natchaug River the Mount Hope River and the Fenton River, which also flow into the Mansfield Hollow Reservoir. After leaving the reservoir, the Natchaug River forms the border between the towns of Mansfield and Windham, and also the border between Windham County and Tolland County. It then flows in and out of the Willimantic Reservoir, which is used for drinking water purposes and not for recreational use, then enters Willimantic. it joins the Willimantic River, forming the Shetucket River. Large boulders and rapids can be found along much of the river. A small oxbow forms just south of the Reservoir, nearby US