Severn river is the longest river in britain ( 338km ) 塞文河是英国最长的河流。全长338公里。
2.
The longest river in britain is the severn river . the most important river is thames river . river clyde is the most important river in scotland 英国最长的河流是赛文河，最重要的河流是泰晤士河。克莱德河是苏格兰最重要的河流。
