OnsøyFrom Wikipedia, the free encyclopedia Onsøy is a peninsula and a former municipality in Østfold county, Norway. The administrative centre was Gressvik. World War II memorial at Onsøy Onsøy Church Elingaard Manor
Onsøy is a peninsula and a former municipality in Østfold county, Norway. The administrative centre was Gressvik. World War II memorial at Onsøy Onsøy Church Elingaard Manor