toward the common zones of the two clouds.

Overall, the study of the molecular line data shows the spatial and velocity connections of two cloud components in the direction of the selected physical system. We have discussed these results in more details in Section \[sec:disc\].

Discussion {#sec:disc}
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Physical environment around W33
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As highlighted earlier, previously published results were mainly focused to the H[ii]{} regions associated with the W33 complex (area $\sim$15 pc $\times$ 15 pc; see a broken box in Figures \[fig1\]a and \[fig1\]b). The large-scale environment around the W33 complex is not yet studied and explored. Such study can enable us to obtain new insights in the target site and to infer different physical mechanism(s) than earlier studies on small-scale environment. The present paper deals with an extended physical system ($\sim$50 pc $\times$ 37 pc), which is investigated by the distribution of 88 ATLASGAL clumps located at a distance of $\sim$2.6 kpc. It is also confirmed by the distribution of molecular gas at \[29.6, 60.2\] km s$^{-1}$, and at least three velocity components (around 35, 45, and 53 km s$^{-1}$) are identified in the direction of our selected physical system (see Section \[sec:coem\]). The physical system is 