Follo is one of three traditional and judicional districts in the fylke (county) of Akershus, Norway, the other two being Romerike and Asker og Bærum. Follo borders Oslo to the North-West, fellow Akershus district Romerike to the North-East and East, and Østfold to the south.The municipalities of Frogn and Vestby have coastlines along the Oslofjord.