I will present a current status of the molecular-cloud survey in the southern sky conducted by Nagoya University with the NANTEN 4m millimeter-submillimeter wave telescope. The NANTEN telescope is installed at the Las Campanas Observatory in Chile. Since 1996, we have carried out surveying molecular clouds, mainly in the J=1-0 transitions of the CO isotopes of 12CO, 13CO, and C18O at a beam size of 2.7 arcmin toward more than a million of points. One of our key projects, the Galactic-plane survey in 12CO, has almost covered 60 deg > l > 240 deg, |b| < 10 deg with grid spacings of 4 arcmin for |b| < 5 deg and of 8 arcmin for the rest. This survey succeeded to reveal the CO distribution in the Galactic plane with higher spatial resolution and sensitivity than the Colombia survey, and resulted in a number of detections of candidates for supershells. We have also covered entire molecular-cloud complexes in major SFRs such as Orion, Chamaeleon and Aquila-Ophiuchus-Lupus, which lead to dense-core surveys. These resulted in finding of molecular clouds and cloud cores with wide ranges of mass, size, and density in various circumstances. A survey for high-latitude molecular clouds has revealed the distribution of new molecular clouds at high Galactic latitude with a relatively high spatial resolution. The physical properties of the molecular gas toward GMCs, dark clouds, cloud cores, and high latitude clouds in the Galaxy are studied.
I will also mention the future plan of NANTEN telescope (move to Atacama site, upgrade for the sub-millimeter waveband).