The river that you have described is the River Thames. However, the river Severn is slightly longer.
The Ganges
The Po is a river that flows eastward across northern Italy.
From the Pacific Ocean eastward across Canada to the Atlantic Ocean
It is a river that flows eastward across northern Italy.
It becomes one day earlier.
The Amazon River
Territory belonging to:-- England-- France-- Spain-- Algeria-- Mali-- Burkina Faso-- Togo-- GhanaEight (8) countries, a whole lot of water, and Antarctica.
The longest distance across a circle is its diameter
The Yangtze river, that flows eastward across central China.The Yellow river (Huang He), which snakes to the northeast in northern China, near Mongolia.
That would depend on if you flew the eastward route across the Atlantic or the westward route across the Pacific.
The big one is the Amazon, but there are probably many other small ones.
NH1