In 2011, researchers discovered two new species of freshwater stingrays in the Amazon River.
The Heliotrygon (rosai and gomesi), commonly referred to as the Pancake stingrays, is the first new genus of stingrays from the Amazon described since 1987.
Manitoulin Island is located within the borders of the Canadian province of Ontario.
It is the largest freshwater island in the world, inhabited by over 13 thousand people. Although it is a lake island, it has 108 freshwater lakes, some of which have their islands too.
As early as the Stone Age, people were settling in the Nile Valley.
The largest population center was north of present-day Aswan. Ancient Egyptians sang a hymn to the Nile, thanking the river for being and bestowing wealth on their country.
The island is divided into five very large municipalities.
The largest of these is Sermersooq, which is also home to Greenland's capital, Nuuk. Sermersooq is the size of Central African Republic and has a population of just over 20,000.
