Bogenhausen is the 13th borough of Munich, Germany. It is the geographically largest borough of Munich and comprises the city's north-eastern quarter, reaching from the Isar on the eastern side of the Englischer Garten to the city limits, bordering on Unterföhring to the north, Aschheim to the east and the Haidhausen borough to the south. In 1805 the Treaty of Bogenhausen was signed which allied Bavaria to Napoleonic France.