Add to ORKGtable3.dat 210x95 Properties of starless clumpsVizieR On-line Data Catalog: J/A+A/540/A113. Originally published in: 2012A&A...540A.113TUnderstanding massive star formation requires comprehensive knowledge about the initial conditions of this process. The cradles of massive stars are believed to be located in dense and massive molecular clumps. In this study, we present an unbiased sample of the earliest stages of massive star formation across 20deg2 of the sky. Within the region 10°1023cm-2. In particular, we identify potential starless clumps on the other side of the Galaxy. The sizes of the clumps range between 0.1pc and 3pc with masses between a few tens of Mȯ up to several ten thousands of Mȯ. (1 data file)