Where is the "Amazon River" of the Tibia?

Question

Where is the longest river of the Tibia?

How many square metres lenght it has?

Answer 1

The longest river in Tibia appears to be the one running through Tiquanda (from the mountains between Darama and the jungle to Port Hope). A close second is the river between Kazordoon and Thais / Venore, that is crossed by the famous dwarven bridge.

If you want to know the exact number of square meters, I'd suggest having a look at this online map and counting how far it goes.