Which country is the largest Muslim country area-wise?

River Douro is the third-longest river in the Iberian Peninsula having total length is 897 kilometers. For 112 kilometers, the river forms part of the national border line between Spain and Portugal.

The Point on the Earth’s surface that lies directly above the source (hypocenter or focus) where an earthquake or an underground explosion originates is called Epicenter. At the epicenter, the strongest shaking occurs during an Earthquake.

Paper currency was first issue in China. Paper currency first developed in Tang dynasty China during the 7th century, although true paper money did not appear until the 11th century, during the Song dynasty.