Sentrum, literally Center, is the core of Oslo inside the first ring road, plus the area around the Royal Palace and Tjuvholmen island. This is the area around Oslo's main street, Karl Johan street, and the Akershus fortress overlooking the harbour and the great Oslo fjord. The Sentrum area is home to many key sights, national institutions, and an array of hotels and restaurants. Sentrum is the starting point for most visitors. Inner East and inner North also have some downtown functions within a short walk from Karl Johan street or from the Central station.
The Sentrum area is home to key national institutions such as the Parliament, the Royal Palace, the Supreme court and most government ministries. The original buildings of University of Oslo occupy a prominent position. The main theater, opera and national museums of art are in the centre. Shopping, eating and drinking dominate main streets. Only about 1000 people live in the centre, including the royal family.