  The Milagro gamma-ray observatory employs a water Cherenkov detector to
observe extensive air showers produced by high-energy particles impacting in
the Earth's atmosphere. A 4800 m$^{2}$ pond instrumented with 723 8" PMTs
detects Cherenkov light produced by secondary air-shower particles. An array of
175 4000 liter water tanks surrounding the central pond detector was recently
added, extending the physical area of the Milagro observatory to 40,000 m$^{2}$
and substantially increasing the sensitivity of the detector. Because of its
wide field of view and high duty cycle, Milagro is ideal for monitoring the
northern sky almost continuously ($>$90% duty cycle) in the 100 GeV to 100 TeV
energy range. Here we discuss the first detection of TeV gamma-rays from the
inner Galactic plane region. We also report the detection of an extended TeV
source coincident with the EGRET source 3EG J0520+2556, as well as the
observation of extended TeV emission from the Cygnus region of the Galactic
plane.
