292 PHYSICAL GEOGRAPHY. 



Rockingham county lies below the level of 500 feet. There must be 

 several islands, or insulated areas of land, above 500 feet to the south of 

 the line as described. 



From Pittsfield the line extends to the lower part of Chichester, and 

 curves back north-easterly along the Soucook valley to the north part of 

 Loudon. It then passes directly to Winnipiseogee lake, after curving 

 nearly to the town of Concord, through Canterbury, Northfield, Belmont, 

 and Gilford. The shore of Lake Winnipiseogee affords the most accu- 

 rate notion of the course of our line in Belknap and Carroll counties, 

 since the average height of the lake is just 500 feet. Returning down 

 the valley, there is a great curve northwardly into Meredith, for the Win- 

 nisquam lake, thence the course is through Tilton and Sanbornton, 

 crowding the Merrimack river opposite Bristol, and bordering the river 

 into Campton and Rumney, the area between the lines varying some- 

 what in width. 



On the west side of the Merrimack the return line cannot pass the 

 barrier till we reach the edge of Concord. It then passes up the Black- 

 water valley into Salisbury. The line passes up to Warner on Warner 

 river, and to Hillsborough on the Contoocook river. Rattlesnake hill, in 

 Concord, becomes an island. From opposite the Mast Yard, in Concord, 

 the line crosses to the Bow hills, turning in Hooksett and Goffstown to 

 pass up to North Weare along the Piscataquog, with a branch to New 

 Boston. The line returns through Bedford, and extends up the Quoh- 

 quinapassakessananagnog creek into Amherst. On the Souhegan river 

 the line may extend into the edge of Lyndeborough. The banks on this 

 river through Wilton are high, and not far apart, so that the area below 

 the level of 500 feet is long and narrow. The line seems to leave the 

 state in the south-west corner of Brookline. 



The line next enters the state in Winchester along the Connecticut 

 valley, and extends to the Fifteen-miles falls in Monroe, curving north- 

 easterly along the valleys of the tributaries. On the Ashuelot, the line 

 extends a little ways above Keene. As the water-shed between the 

 Ashuelot and Connecticut rivers continues to the village of Hinsdale as 

 a prominent ridge, the area below five hundred feet is very marked on the 

 map in the former valley. On Cold river, the line runs up to the edge of 

 Acworth ; on Sugar river, nearly to Claremont village ; on Mascomy river, 



