  This paper reports the diffuse X-ray features around the Galactic center
observed with Chandra. We confirm the ASCA and Ginga discoveries of the
large-scale thin-thermal plasma with strong lines in the Galactic center
region. In addition, many small clumps of emission lines from neutral (6.4 keV
line) to He-like (6.7 keV line) irons are discovered. The 6.4 keV line clumps
would be reflection nebulae, while those of the 6.7 keV line are likely SNRs.
We also find emission lines of intermediate energy between 6.5-6.7 keV, which
are attributable to young SNRs in non equilibrium ionization. Non-thermal
filaments or belts with X-ray spectra of no emission line are found, suggesting
the Fermi acceleration site in a rapidly expanding shell. All these suggest
that multiple-supernovae or extremely large explosion had occurred around the
Galactic center region in the recent past.
