sentences:  In describing Naples Mound #8 Henderson states, "On the right bank of the Illinois river about 300 yards below [south of] Griggsville Landing, rises a lofty bluff fully 300 feet above the level of the river.On the summit is a beautiful, oval mound, 150 long, 92 feet wide in the middle, and 25 or 30 feet high.... within a radius of 5 miles from Naples there are a least fifty mounds, very few of which have ever been opened".