New Defender's Study Bible Notes
65:9 river of God. The “river of God” in this context refers to the remarkable machine known as the hydrologic cycle, which continually provides water for the life of the earth.
Psalm 66 (title) A Song or Psalm. The superscript to this psalm (also Psalms 30, 48, 65, 67, and 68) calls it “A Song or Psalm,” presumably denoting it as appropriate for either reciting or singing. Whereas many of those preceding this series (i.e., Psalms 56–64) have been psalms of deep concern, often with notes of lamentation or even imprecation, the psalms in this category are songs emphasizing victory and praise.