The Ohio River below Louisville passes Evansville, the chief town of southwestern Indiana, having sixty thousand people and a large trade. A short distance beyond, the Wabash River flows in, the boundary between Indiana and Illinois. Shawneetown in southern Illinois and Paducah in Kentucky are passed, and the Ohio River finally discharges its waters into the Mississippi at Cairo, the southern extremity of Illinois, the town being built upon a long, low peninsula protruding between the two great rivers, around which extensive levees have been constructed to prevent inundation. The place has about twelve thousand people and considerable manufacturing industry. All about is an extensive prairie land, which in times of great spring freshets is generally overflowed. CUMBERLAND AND TENNESSEE RIVERS. A large portion of the waters brought down by the Ohio come from its two great affluents flowing in almost alongside each other on the southern bank, just above Paducah, the Cumberland and Tennessee Rivers. The Cumberland has its sources in the Cumberland Mountains, the eastern boundary of Kentucky, and flows for six hundred and fifty miles, the whole length of that State, making a wide, sweeping circuit down into Tennessee, where it passes Nashville, at the head of steamboat navigation, two hundred miles from its mouth. For twenty miles above their mouths, in their lower courses, these two great rivers are rarely more than three miles apart. The Tennessee is twelve hundred miles long from its head stream, the Holston River, rising in the mountains east of Kentucky and Tennessee. It comes through East Tennessee, makes a great bend down into Alabama, and then coming up northward flows through Tennessee and Kentucky to the Ohio. It is navigable for nearly three hundred miles to the Mussel Shoals at Florence, Alabama, where canals and locks have improved the navigation for twenty miles past the shoals, and it can also be navigated for eight hundred miles above, excepting at very low stages of water. Its name signifies "the river of the Great Bend," and it was also called in early times the "river of the Cherokees."