is a harbor located in the northwest of Gilneas, just prior to crossing into the Headlands. This is where the night elves and worgen are attempting a final push against the Forsaken and orc attackers, driving them from Gilneas.
As a shipbuilding term, keel is long beam laid at the bottom of hull and going through almost whole ship.
Keel Harbor may be also a reference to German port city of Kiel (pronunciation the same as Keel), which is one of the biggest harbors and shipbuilding centres in Europe.