...eastern part of the Danubian Plain, the Popovo Uplands, and parts of the Razgrad Heights, ...eastern part of the Danubian Plain, the Popovo Uplands, and parts of the Razgrad Heights, ...among them. There are spa springs near Targovishte and Yastrebino is the largest dam. The region ...among them. There are spa springs near Targovishte and Yastrebino is the largest dam... Reference