Date: 2017-08-01 08:01
Made by Saul Sheard aka Sparklekitten. This a map/terrain of Nii-jima, an island off the south coast of Japan just near Tokyo.
To install nii-jima you should use modfolders to keep it seperate from the official game content to prevent issues.
With Arma 3 you can use different ways to set up your modfolders to use custom content you have downloaded.
Please visit the Arma 3 Mod install instructions page for more information about using custom mods and addons in Arma 3.