  Understanding the 3D structure of the Milky Way is a crucial step in deriving
properties of the star-forming regions, as well as the Galaxy as a whole. We
present a novel 3D map of the Milky Way plane that extends to 10 kpc distance
from the Sun. We leverage the wealth of information in the near-IR APOGEE
dataset and combine that with our state-of-the-art 3D mapping technique using
Bayesian statistics and the Gaussian process to provide a large-scale 3D map of
the dust in the Milky Way. Our map stretches across 10 kpc along both the X and
Y axes, and 750 pc in the Z direction, perpendicular to the Galactic plane. Our
results reveal multi-scale over-densities as well as large cavities in the
Galactic plane and shed new light on the Galactic structure and spiral arms. We
also provide a catalogue of large molecular clouds identified by our map with
accurate distance and volume density estimates. Utilising volume densities
derived from this map, we explore mass distribution across various
Galactocentric radii. A general decline towards the outer Galaxy is observed,
followed by local peaks, some aligning with established features like the
Molecular Ring and segments of the spiral arms. Moreover, this work explores
extragalactic observational effects on derived properties of molecular clouds
by demonstrating the potential biases arising from column density measurements
in inferring properties of these regions, and opens exciting avenues for
further exploration and analysis, offering a deeper perspective on the complex
processes that shape our galaxy and beyond.
