Doraelus Hills is a 3v3 map created for the 2016 season 1 ladder of Legacy of the Void. It continues to be used in the current map pool.
Official Map Description[]
Expansions are fairly easy to take on this map, but opening up new expansion areas by breaking rocks also means that your team may be attacked from different angles.
References[]
Blizzard Entertainment. StarCraft II. (Activision Blizzard) Map: Doraelus Hills (in English). 2016.