First result on Google & CIA world Factbook are both about 350,000 km. https://www.quora.com/How-many-miles-of-coastline-are-there-in-the-world https://www.quo

First result on Google & CIA world Factbook are both about 350,000 km. https://www.quora.com/How-many-miles-of-coastline-are-there-in-the-world https://www.quora.com/How-many-miles-of-coastline-are-there-...