Hello? I'm RexTerran
This map name is Ruined City.
If you go out of your 2nd bases, you can face two ways to get the 3rd bases. one is 6, 12o'clock that can go to center directly. the other is 3, 9o'clock which can get to up or down of this map and go to center. They have 4th bases differently shape.
The center has two zelnaga watch tower that can provide you with extensive view.
Also, the 1, 7o' clock bases can give you the secretly buildings or detour.
you can search this map typing "Yeoul_Ruined City"