Further, the post was located deep within a several hundred mile stretch of the Missouri River known as the Missouri Breaks, which are steeply eroded badlands bordering the river and separating it from the surrounding eastern Montana plains.
Further, the post was located deep within a several hundred mile stretch of the Missouri River. This Missouri River was known as the Missouri Breaks. The Missouri Breaks are steeply eroded badlands. The Missouri Breaks was bordering the river. The Missouri Breaks was separating it from the surrounding eastern Montana plains.