The Eridanos delta

This is an animation (click on picture) showing the Neogene basin fill of the North Sea Basin. It is based on seismic data interpretation. Over the last 10 million years a huge river and delta-system, called Eridanos, drained Northwestern Europe, including Scandinavia, North Poland, Northern Germany, Denmark and the Netherlands. The drainage area may be compared with the present Orinoco, making it one of the largest delta's in the world. In the 9 million years it existed the river rapidly dumped sediment into the subsiding North Sea Basin, leaving 1500 m thick deposits in the centre of the basin. About 1 millio years ago the system has probaly been destroyed by the advancing land-ice.
More info on the Eridanos delta, see article:
The late Cenozoic Eridanos delta system in the Southern North Sea Basin.pdf

The Volga delta

In the present animation, (click on picture) you can see the simulated deposition of the Volga delta over the last 10 000 years. It starts at 10 000 years ago and runs to the present. The colors indicate the grainsize of the sediment. redish = coarse sediments, blueish = fine sediments. Because the Caspian sea level fluctuated tremendously in that time and the Caspian Basin has a very low-gradient, the depocentre of the delta shifted over the plain. Coastline migration (over the x-axis) is upto 120 km! The rapid changes make the Volga delta an excellent natural laboratory for studying sea-level changes.