From each other by their partings, but making together one great bed of from 25 to 40 ft.
The water-partings are characteristically level uplands, often with shallow depressions, once lakes, and some of them still so.
Markable differences in the drainage areas of their two sides, with interesting illustrations of shifting water-partings; and the White, Gasconade, Osage and other rivers are remarkable for .upland meanders, lying, not on flood-plains, but around the spurs of a highland country.'
The forty ancient counties, remnants of various historical groupings and partings, are occasionally bounded by rivers.
For the reservation of the water-partings in the past considerably denuded by lumbermen and ranchmen the increase of the forest areas, and the creation of reservoirs along the rivers, to control their erratic flow 2 and impound their flood waste for purposes of irrigation, much has been done by the national government.