  We report the discovery of a $1^\circ$ scale X-ray plume in the northern
Galactic Center (GC) region observed with Suzaku. The plume is located at ($l$,
$b$) $\sim$ ($0\mbox{$.\!\!^\circ$}2$, $0\mbox{$.\!\!^\circ$}6$), east of the
radio lobe reported by previous studies. No significant X-ray excesses are
found inside or to the west of the radio lobe. The spectrum of the plume
exhibits strong emission lines from highly ionized Mg, Si, and S that is
reproduced by a thin thermal plasma model with $kT \sim 0.7$ keV and solar
metallicity. There is no signature of non-equilibrium ionization. The
unabsorbed surface brightness is $3\times10^{-14}$ erg cm$^{-2}$ s$^{-1}$
arcmin$^{-2}$ in the 1.5-3.0 keV band. Strong interstellar absorption in the
soft X-ray band indicates that the plume is not a foreground source but is at
the GC distance, giving a physical size of $\sim$100 pc, a density of 0.1
cm$^{-3}$, thermal pressure of $1\times10^{-10}$ erg cm$^{-3}$, mass of 600
$M_\odot$ and thermal energy of $7\times10^{50}$ erg. From the apparent
association with a polarized radio emission, we propose that the X-ray plume is
a magnetized hot gas outflow from the GC.
