where river valleys are partially submerged - otherwise known as drowned estuaries
example of a rias
Milford Heaven in South Wales
characteristics of a rias
gentle long and cross profile
wide and deep at mouth - become narrower and shallower the further inland they reach
how are fjords formed?
rising sea levels flood deep glacial valleys to create natural inlets and harbours
examples of a fjord
Sognefjord in Norway - over 1000m deep in places
characteristics of a fjord
straight and narrow with steep sides
shallow mouth caused by raised bit of ground (threshold) formed by deposition of material by a glacier
deep further inland you go
how does Dalmatian Coasts form?
changes to volume of water in oceans - where fold hills and hence valleys lie parallel to one another
when these valleys are flooded the tops remain above sea level and appear as a series of long islands running parallel to the coastline. Seperated by narrow sea channels called sounds
