Tromøya

Tromøya (Urban East Norwegian:) or Tromøy (Urban East Norwegian:) is the largest island in Southern Norway. The 28.6-square-kilometre (11.0 sq mi) island is entirely located within Arendal Municipality in Agder county, Norway. The island has about 5,300 residents (in 2015) which gives it a population density of about 185 inhabitants per square kilometre (480/sq mi). The island is located directly across the harbor from the town of Arendal. The highest point on the island is the 95-metre (312 ft) tall Vardåsen. The island is separated from the mainland to the north by the strait and it is separated from the island of Hisøy to the southwest by the Galtesundet strait.

The 400-metre (1,300 ft) long Tromøy Bridge (Norwegian: Tromøybroa) is the suspension bridge that has been the only road connection to the mainland since it was completed in 1961. There is also a passenger ferry that takes six minutes to transport riders from Skilsø to the town of Arendal. The company Aker Pusnes is located in Pusnes. It is a designer and supplier of all types of deck machinery and mooring systems for marine and offshore applications.

Historically, the island belonged to the old Østre Moland Municipality until 1878. From 1878 until 1992, the island was part of Tromøy Municipality. Since 1992, the island has been a part of Arendal Municipality.