As a part of the Milky Way Imaging Scroll Painting (MWISP) survey, we performed a
simultaneous 12CO (1-0), 13CO (1-0), C18O (1-0) mapping toward molecular clouds in a
region encompassing 3.75 square degrees. We reveal three molecular clouds, the 15 km/s
cloud, the 27 km/s cloud, and the 50 km/s cloud, in the surveyed region. The 50 km/s cloud is
resolved with an angular resolution of around 1'for the first time. Investigating their
morphology and velocity structures, we find that the 27 km/s cloud is likely affected by …

Context. Molecular clouds trace the spiral arms of the Milky Way and all its star forming
regions. Large-scale mapping of molecular clouds will provide an approach to understand
the processes that govern star formation and molecular cloud evolution. Aims. As a part of
the Milky Way Imaging Scroll Painting (MWISP) survey, the aim is to study the physical
properties of molecular clouds and their associated star formation toward the Galactic plane
within 216.25°≤ l≤ 218.75° and− 0.75°≤ b≤ 1.25°, which covers the molecular cloud …