East Norway (Norwegian: Østlandet) is a region in south-eastern Norway, which contains the capital Oslo, as well as half of the country's 5 million inhabitants. From the central lowlands around Oslo, Oslofjord and lake Mjøsa long valleys cut into the uplands and high mountains until the watershed with Trøndelag and West Norway. East Norway is home to Norway's biggest lakes and rivers, widest forests and highest mountains. The pleasant climate and gentle coastline of Oslofjord is a fascinating contrast to the high mountains.