He has remembered his covenant for all ages: the word that he entrusted to a thousand generations
Other versions
King James Version
They go up by the mountains; they go down by the valleys unto the place which thou hast founded for them. English Standard Version
The mountains rose, the valleys sank down to the place that you appointed for them.New International Version
they flowed over the mountains, they went down into the valleys, to the place you assigned for them.