Gibraltar, Sunset#
![Gibraltar, Sunset Gibraltar, Sunset](/attach/Geography/Africa/Morocco/Pictures/Factbook_Pictures/130mo/130mo.jpg)
Image credit: NASA., under PD
The older packet (labeled) contains at least 14 waves, which can be counted like tree rings. A younger group is forming near the middle of the strait (marked by the carat south of Gibraltar).
The waves are generated as a diurnal tidal pulse flows over the shallow Camarinal Sill at Gibraltar. The waves flow eastward and refract around coastal features; they can be traced for as much as 150 km.