348 ILLINOIS STATE ACADEMY OF SCIENCE 



The lowland lies along the Wabash and Embarrass 

 rivers, and extends for some distance up the small tri- 

 butaries. The greatest extent of lowland is along the 

 Wabash river above its junction with the Embarrass. 

 This lowland is narrow in the northeast corner of the 

 county, at which place the hills of the upland push almost 

 to the river, but extending south, it widens rapidly to- 

 ward the west until it meets the lowland of the Embar 

 rass just north of Lawrenceville, the county seat. 

 Southeast of Lawrenceville, it narrows to a width 

 of two miles at the junction of the two rivers, and 

 below the junction a width of about two miles is main- 

 tained. The Embarrass river lowland enters the county 

 from the north with a width of about three miles, and 

 extends in a southeastern direction until it merges with 

 that of the Wabash north of Lawrenceville. 



Two tributaries enter the Embarrass river from the 

 west, Indian Creek, about six miles above the river's 

 mouth, and Muddy Creek in the north part of the county. 

 From the northeast, Brushy Fork flows into the Embar- 

 rass a few miles below the mouth of the Muddy Creek. 

 A number of artificial ditches drain the wide expanse 

 of lowland between the Wabash and Embarrass rivers 

 and it is significant that almost all the water from these 

 ditches drains into the Embarrass river. The southern 

 part of the county is drained by Raccoon Creek, which 

 flows in a southeastern direction and enters the Wabash 

 a few miles south of the southern boundary of the county. 



The upland, occupying the remainder of the area, is 

 divided by the Embarrass river into two portions. One 

 is a V-shaped section in the northeastern part of the 

 county between the lowland of the Wabash and Embar- 

 rass rivers. The other' occupies the western and southern 

 portions. This second part is comparatively narrow at 

 the north, being about three miles in width. It widens, 

 however, gradually, until along the southern boundary 

 it extends across almost the full width of the county. 



The upland is gently rolling, with a difference in eleva- 

 tion between the divides and the valleys of not over fifty 

 feet. The valleys are wide and the divides, between 

 the drainage basins of the small creeks, are low hills 



