Coasts, waves break with great force against the land shaping the hill sides into cliffs. Rocky coasts are found in high mountainous regions where steep hills plunge directly into the sea.
Along the high rocky coasts, the rivers appear to have been drowned with highly irregular coastline. The coastline appears highly indented with extension of water into the land where glacial valleys (fjords) are present.
Coasts, waves break with great force against the land shaping the hill sides into cliffs. Bars (long ridges of sand and/or shingle parallel to the coast) in the nearshore zone. Bars are submerged features and when bars show up above water, they are called barrier bars.
Barrier bar which get keyed up to the headland of a bay is called a spit. When barrier bars and spits form at the mouth of a bay and block it, a lagoon forms.
The lagoons would gradually get filled up by sediments from the land giving rise to a coastal plain.
