Fixed a few things I didn't like about this tune. :3 Reuploading!

Deep in the jungles north and west of Sable Grove -LINK- on the border between Tykondrus and Pentala, sits Puerta Azul, or the Blue Gate. This enormous dam is the largest on Elancia, and was constructed in pre-Elian times rather crudely with the power of magic to prevent devastating floods from washing away the former capital -LINK-

Although little of the original dam remains, modern engineers and machines have reconstructed the dam to function optimally and prevent flooding on both sides of the border. As an added bonus (and perhaps more lucratively) those that maintain the dam use many dredging machines to draw up fine silt from the lake floor to sell off to farmers for a pretty penny.
At almost any time of the day, the dredging machines can be seen peeking up out of the waters behind the dam. Having been constructed during times when water was low, they sit toiling away day and night, while the people of Puerta Azul regularly maintain them and draw out the silt on barges to be loaded into wagons and hauled to Sandalio -LINK-
Of interest, the machines have recently bumped into some star-junk at river's bottom, and hauled it up to the surface. Junkers are inspecting the star-junk, and it appears to be a space-going vessel of some sort.

The city of Puerta Azul is filled with hardworking people, and also the furthest point west in Tykondrus. At the west end of the dam sits the checkpoint between Tykondrus and Pentala, through which travelers must pass.