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thumb|Hovedøya seen from the mainland in Oslo thumbnail|The old military storage facility on Hovedøya thumb|right|The ruins of the Cistercian monastery on Hovedøya, Oslo Hovedøya is one of several small islands off the coast of Oslo, Norway in the Oslofjord. The island is quite small, no more than 800 metres across in any direction, the total area is 0.4 square kilometre. Its population is 5. It is well known for its lush and green nature, with a wide variety of trees, bushes and flowers. For many, many years there was a military base on the island.
thumb|Hovedøya seen from the mainland in Oslo thumbnail|The old military storage facility on Hovedøya thumb|right|The ruins of the Cistercian monastery on Hovedøya, Oslo Hovedøya is one of several small islands off the coast of Oslo, Norway in the Oslofjord. The island is quite small, no more than 800 metres across in any direction, the total area is 0.4 square kilometre. Its population is 5. It is well known for its lush and green nature, with a wide variety of trees, bushes and flowers. For many, many years there was a military base on the island.
== The name == The name is from Norse times (Hǫfudøy). The first element is hǫfud 'head' (here in the sense 'hill' or 'height'), the last element is the finite form of øy 'island'. The name is a reference to the top of the hill on the island - at 47 metres it is the tallest point of the inner Oslofjord islands by a good margin. (See also Nakholmen.)
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).