Extrution of layer

[GemariahGodiya]

so i have these layers and i want to convert it into this but  then i am just a beginner... i don't know there to start from

[MervynLotter]

This great video from John Nelson may help Bing Videos

Or go to YouTube and search for "How to Make this 3D Diorama of the Straits of Mackinac"