Eratosthenes was the first geographer. He brought the concept of geography, a common field of science. Thousands of years ago, when the world was unexplored, exotic, and beyond anyone’s imagination, Eratosthenes was the one who spotted this term. He was one of the biggest contributors to the science of geography.
Eratosthenes was a Greek Mathematician and dexterous geographer. Initially, he developed one of the earliest maps between the year 276-195 BC. However, his greatest milestone was the concept of latitude and longitude. According to him, the word “Geography” is made up of two words - "Geo" means the earth and "Graphein" means to write.
It is also believed that he became the first man ever to calculate the appropriate size of the earth with a minimum of 2% error approximately. For his remarkable accomplishments, Eratosthenes will always lie at the top of the renowned geographers' list.
Talking about Geography, it’s a branch of social science which deals with the study of islands, continents, features, inhabitants, and natural processes of the earth. In short, it is an overall study of the earth.