  We present an analysis of Kr I 1236 line measurements from 50 sight lines in
the Hubble Space Telescope Space Telescope Imaging Spectrograph and Goddard
High Resolution Spectrograph data archives that have sufficiently high
resolution and signal-to-noise ratio to permit reliable krypton-to-hydrogen
abundance ratio determinations. The distribution of Kr/H ratios in this sample
is consistent with a single value for the ISM within 5900 pc of the Sun,
log(Kr/H) = -9.02+/-0.02, apart from a rough annulus from between about 600 and
2500 pc distant. The Kr/H ratio toward stars within this annulus is elevated by
approximately 0.11 dex, similar to previously noted elevations of O/H and Cu/H
gas-phase abundances beyond about 800 pc. A significant drop in the gas-phase
N/O ratio in the same region suggests that this is an artifact of
nucleosynthetic history. Since the physical scale of the annulus' inner edge is
comparable to the radius of the Gould Belt and the outer limit of heliocentric
distances where the D/H abundance ratio is highly variable, these phenomena may
be related to the Gould Belt's origins.
