It's simple. We
The industrial area found in C4/5->D4/5 is a great little arena for mechs to battle in.
It provides unique pathways to accommodate lights, and cover from long range fire by way of large buildings.
It also provides a non-perfect cover, so any mech's battling in there will not "truly* be safe from incoming fire support. (Sporadic large structures, not all cover large enough to block LRM salvoes).
This would make the section on the map (highlight, and apologies for using old templates) actually viable for tactical decisions. This is opposed to using the "3-line" with the ridge cover, or the volcano lips for a combat focal point.
By all means, keep the lame-*** water area for people to frolick in, when they have spare time, but this would make that entire side of the map more fun for *EVERYONE*.
http://imgur.com/9X97XYu