The place - i. e., The spring or river-head. It would seem that the ancient Hebrews regarded the clouds as the immediate feeders of the springs (Proverbs 8:28, and Psalms 104:10, Psalms 104:13). Genesis 2:6 indicates some acquaintance with the process and result of evaporation.
Related Commentaries of Ecclesiastes 1:7
Ecclesiastes 1:7
7 All the rivers run into the sea; yet the sea is not full; unto the place from whence the rivers come, thither they returnb again.