Put the numerals in a written form. the thames is the longest river in england it is 334 kilometres long. the lena is the longest river in russia , it is 4,400 kilometres long.ben nevis is the highest mountain in the uk , it is 1,343 metres high. elbrus is the highest mountain in russia , it is 5,642 metres high. lake loch ness is the deepest lake in the uk it is 230 metres deep . lake baikal is the deepest lake in russia , it is 1,637 metres deep.