Помогите ответить, пожалуйста! In what parts of the world there are large territories of plain? in what parts of the world…

1) Most flat place on earth located in the eastern part of Europe. This plain is called the East-European. This place is very nice, smooth green open spaces on all sides. 2) The longest river in the world is the Amazon. It flows to the north of South America. Its slowness from 6259 to 6800 killometrov killometrov. The second longest river in the world is the Nile. Its slowness killometrov 6650. It flows to the north-east Africa.