Riddarfjärden
Riddarfjärden (, "The Knight Firth") is the easternmost bay of Lake Mälaren in central Stockholm. Stockholm was founded in 1252 on an island in the stream where Lake Mälaren (from the west) drains into the Baltic Sea (to the east); today the island is called Stadsholmen and constitutes Stockholm's Old Town.
Norrmalm
The name Norrmalm is first mentioned in 1288. In 1602 Norrmalm became an independent city with its own mayor and administration called Norra Förstaden ("Northern Suburb"). The town was short-lived and in 1635 it was incorporated with Stockholm again. Norrmalm is today considered to be the central part of Stockholm.