Build me a world map for unity

I need a big world map as unity object, similar to the map of Civilization V * It has to be plane. * The tiles should be square tiles or hexagonal. * Each tile has to have 55 km (off real world) more or less, so it would be about 300.000 tiles. *The unity size of a tile must be 10*10 Unity3D units. * Each tile has to be clickable and get back its x,y position. *I need only the ground object, but it has tu return its location even if it was clicked on the sea * It has to be divided by clickable tiles and unbounded like the earth. * It has to be navigable with mouse rather x,y edges and zoom with mouse wheel * Also a minimap on the top-right side will show the current view on the whole map. * A click on the minimap must show the view of the clicked position on the big map. * A square representing the big map view must be shown on the minimap I will provide the ground texture and some more data.