The depiction of the Neutral Zone during the Kobayashi Maru test in Star Trek: The Wrath of Khan has never seemed quite right to me.
While taking the Kobayashi Maru test, initially Lt. Saavik orders Sulu to plot a parabolic course around the Neutral Zone, implying that the Neutral Zone is the ellipsoid shaped blob shown on the view screen.
Furthermore, the disabled vessel Kobayashi Maru is located in the Gamma Hydra system inside the Neutral Zone ellipsoid.
Shouldn't the Neutral Zone be represented as a flat surface dividing Federation and Klingon space? Or is this meant to be only an abstract picture of the Neutral Zone? The other possibility is that Gamma Hydra lies within an isolated pocket of the Neutral Zone surrounded by Federation space. But that would mean the simulated Klingon vessels would have had to cross Federation space to reach Gamma Hydra, in violation of Treaty, which doesn't make sense.